Kaizen #8 - Handling Recurrence and Participants in the Events Module via API

Kaizen #8 - Handling Recurrence and Participants in the Events Module via API

Hello everyone!

We are back this week with an exciting post—Handling recurrence and participants in the Events module through API.

First things first—What is the Events module?
"Events" is a part of the Activities module in Zoho CRM. 
An event is an activity that happens at a given place and time. You can find Events on the user's Zoho CRM's home page, Activities home page, Calendar, and in other related records.

What are the types of Events?
Events are of two types—Recurring and non-recurring events.
Recurring events: These events repeat/recur at a set frequency. You can set them to repeat by day, week, month, or by year. You can also set them to repeat a fixed number of times. 
Non-recurring events: These are one-time events.
Both these events can also be all-day events.

Now, let us see how to handle a recurring event and add/update participants via API.

1. Creating a Recurring Event through API
You must use the Insert Records API to insert a record in the Events module.

Request URL: {{api-domain}}/crm/v2/Events
Request method: POST

Sample input to create a recurring event that repeats every two weeks

{
    "data": [
        {
            "All_Day": false,
            "Event_Title": "Kaizen_9_Weekly",
            "Start_DateTime": "2020-02-02T10:00:00+05:30",
            "End_DateTime": "2020-02-02T11:00:00+05:30",
            "Participants": [
                {
                    "type": "contact",
                    "participant": "3652397000001281003"
                },
                {
                    "type": "lead",
                    "participant": "3652397000000415063"
                },
                {
                    "type": "user",
                    "participant": "3652397000000186017"
                }
            ],
            "Recurring_Activity": {
                "RRULE": "FREQ=WEEKLY;BYDAY=SU;INTERVAL=2;UNTIL=2020-03-15"
            },
            "Remind_At": "2020-02-01T09:45:00+05:30",
            "Who_Id": {
                "id": "3652397000000649013",
                "name": "Patricia Boyle"
            },
            "Venue": "Chennai",
            "$se_module": "Accounts",
            "What_Id": "3652397000000624046",
            "$send_notification": true
        }
    ]
}


Mandatory keys
The following table lists the mandatory fields you must specify while creating a recurring event. Not including any one of these fields results in the MANDATORY_NOT_FOUND error.

Key
Data Type
Description
Event_Title
String
Title of the event. Accepts a maximum of 255 characters, alphanumeric, and special characters. 
Start_DateTime
DateTime
The date and time (in ISO8601 format) at which the event begins. 
End_DateTime
DateTime
The date and time (in ISO8601 format) at which the event ends. 
Recurring_Activity
JSON Object
JSON Object that contains information about the recurrence pattern of the event in the key "RRULE".

Other Keys

Key
Data Type
Description
All_day
Boolean
Represents if the event takes place all day.
Participants
JSON Array
Contains the ID and type of each participant in individual JSON objects. Possible participant types are "lead", "contact", "user", and "email".
Remind_At
DateTime
The date and time in the current user's time zone (in ISO8601 format) at which a reminder is sent to the participants. 
Who_Id
JSON Object
The name and ID of the contact that the event is related to; that contact may or may not be a participant of the event.
What_Id
JSON Object
The name and ID of the Account, Deal, Product, Quote, Invoice, Campaign, Vendor, Case, Purchase Order, or Sales Order that the event is created for.
$se_module
String
The API name of the parent module given in the key "What_Id". This key is mandatory when you include the "What_Id".
Venue
String
The place where the event takes place. Accepts a maximum of 255 characters, alphanumeric, and special characters.
$send_notification
Boolean
Represents if you want to send invitations to the participants of the event. The value true sends out invitations, and false does not. 

We will now discuss the Participants and RRULE keys in detail.

1.1 Participants
The Participants key is a JSON array of participant JSON objects. You can add four types of participants to an event—lead, contact, user, and email. 
You must include each of these participant types as individual JSON objects inside this array as shown below.

"Participants": [
        {
            "type": "contact",
            "participant": "3652397000001281003"
        },
        {
            "type": "lead",
            "participant": "3652397000000415063"
        },
        {
            "type": "user",
            "participant": "3652397000000186017"
        },
        {
            "type": "email",
            "participant": "carissa-kidman@yahoo.com"
        }
]

Where, 
type - The type of participant. The possible values are lead, contact, user, email
participant -  The record ID of the lead, contact, or user.

1.2 RRULE
RRULE is the key in the Recurring_Activity JSON object that determines the recurrence pattern of the event. 
RRULE holds multiple key-value pairs for different types of recurring events (i.e Daily, Weekly, Monthly, Yearly). You must separate each key-value pair by a semicolon.

Mandatory key-value pairs for RRULE
Key
Possible Values
Description
FREQ
DAILY, WEEKLY, MONTHLY, YEARLY
Frequency; represents how often the event repeats. 
INTERVAL
1–99
The gap between each event. For example, for a weekly recurring event, if the INTERVAL value is 2, the gap between the first and the next event will be two weeks. 
COUNT
1–99
The number of events you want to create. For example, if the COUNT value is 3, three events will be created. 

Note
You must specify FREQ and (INTERVAL or COUNT) in RRULE.

Other key-value pairs in RRULE
Key
Possible Values
Description
BYMONTHDAY
1–31
The day of the month the event repeats on. Applicable only for  monthly and yearly events.
BYDAY
SU, MO, TU, WE, TH, FR, SA
The day of the week the event repeats on. Applicable for daily, weekly, monthly, and yearly events.
BYSETPOS
1, 2, 3, 4, -1 
The week of the month the event repeats in.
Applicable only for monthly and yearly events.
1 - Event repeats every first week of the month
2 - Event repeats every second week of the month
3 - Event repeats every third week of the month
4 - Event repeats every fourth week of the month
-1 - Event repeats every last week of the month.
UNTIL
Date in yyyy-MM-dd format
The date until which the event must repeat.

Therefore, according to the sample input given at the beginning of the post, the event starts on Feb 2, 2020 at 10:00 AM and ends the same day at 11:00 AM.

According to  "RRULE":"FREQ=WEEKLY;BYDAY=SU;INTERVAL=2;UNTIL=2020-03-15", the event occurs every Sunday, with an interval of 14 days (2 weeks), and recurs until Mar 15, 2020.
Therefore, the sequence is as shown below.
  1. The event begins on Feb 2, 2020.
  2. The first recurring event happens on Feb 16, 2020.
  3. The second recurring event happens on Mar 1, 2020.
  4. The last recurring event happens on Mar 15, 2020.
Therefore, the response will have four JSON objects—one for the first event as specified in the Start_DateTime key, and one for each recurring event.

Note
You can only create one set of recurring events using the RRULE in a single API call.

A few other examples of RRULE:
  • "RRULE": "FREQ=MONTHLY;COUNT=3;BYDAY=WE;BYSETPOS=2".
    This RRULE creates three events that recur every Wednesday in the second week of the month.
  • "RRULE": "FREQ=MONTHLY;INTERVAL=2;COUNT=3;BYMONTHDAY=14".
    This RRULE creates three events that recur on the 14th day of the month, and repeat once in two months.

2. Updating an Event
You must use the Update Specific Record API to update an event.
In this section, we will discuss
  1. Adding a participant to an event
  2. Updating all future events
2.1 . Adding a participant to an event
Details you need to add a participant to an event
  1. The event's record ID. You can obtain this from the response you received while creating the event.
  2. The ID of the participants that are added already. The GET Specific Event response will have a unique ID for each participant in the "Participants" JSON array.
The sample input is as follows.

{
    "data": [
        {
            "All_Day": false,
            "Event_Title": "Kaizen_10_Weekly",
            "Start_DateTime": "2020-02-02T11:00:00+05:30",
            "End_DateTime": "2020-02-02T12:00:00+05:30",
            "Participants": [
                {
                    "type": "contact",
                    "participant": "3652397000001281003",
                    "id": "3652397000001326102"
                },
                {
                    "type": "lead",
                    "participant": "3652397000000415063",
                    "id": "3652397000001326100"
                },
                {
                    "type": "user",
                    "participant": "3652397000000186017",
                    "id": "3652397000001326098"
                },
                {
                    "type": "email",
                    "participant": "john-butt@gmail.com"
                }
            ],
            "Remind_At": "2020-02-01T10:45:00+05:30",
            "$send_notification": true
        }
    ]
}
As you can see, a new participant of type email and email ID john-butt@gmail.com is added. Since the ID of the existing participant with the email ID carissa-batman@yahoo.com is not specified, it gets deleted.

Note
  • participant is the record ID of the participant (lead, contact, or user).
  • ID is the unique ID of the participant for that event.
  • While adding a participant, you must specify the IDs of other participants for the event. Otherwise, only the new participant is added, while the rest are deleted.

2.1 . Updating all future events
While updating an event, you can choose to update all future events with the new change.
Use the boolean key update_all_future_events. The value true updates all future events, and the value false updates only that particular event.
Here is a sample input.

{
    "data": [
        {
            "All_Day": false,
            "Event_Title": "Kaizen_10_Weekly",
            "Start_DateTime": "2020-02-02T11:00:00+05:30",
            "End_DateTime": "2020-02-02T12:00:00+05:30",
            "Participants": [
                {
                    "type": "contact",
                    "participant": "3652397000001281003",
                    "id": "3652397000001326102"
                },
                {
                    "type": "lead",
                    "participant": "3652397000000415063",
                    "id": "3652397000001326100"
                },
                {
                    "type": "user",
                    "participant": "3652397000000186017",
                    "id": "3652397000001326098"
                },
                {
                    "type": "email",
                    "participant": "carissa-kidman@yahoo.com"
                }
            ],
            "Remind_At": "2020-02-01T10:45:00+05:30",
            "update_all_future_events": true,
            "$send_notification": true
        }
    ]
}

Points to Note
While creating recurring events,
  • You must specify either COUNT or INTERVAL in the RRULE. Otherwise, the system creates 365-day events.
  • For WEEKLY recurring events, you must include BYDAY in RRULE. Otherwise, the system creates 365-day events that recurs weekly.

While updating a recurring event,
  • You must specify the record ID of the event you want to update. 
  • You must set the value of the key update_all_future_events to true to update all future events. Otherwise, the system updates only that event and the other recurring events that you created previously will remain unaltered.
  • While adding a participant, you must specify the IDs of other participants. Otherwise, only the new participant is added, while the rest are deleted.
  • You cannot update RRULE through the API.
  • You cannot update check-in related information through the API.

We hope you found this post useful. Please reach out to us if you have questions, or let us know in the comment section.
Cheers!
















    • Sticky Posts

    • Kaizen #198: Using Client Script for Custom Validation in Blueprint

      Nearing 200th Kaizen Post – 1 More to the Big Two-Oh-Oh! Do you have any questions, suggestions, or topics you would like us to cover in future posts? Your insights and suggestions help us shape future content and make this series better for everyone.
    • Kaizen #226: Using ZRC in Client Script

      Hello everyone! Welcome to another week of Kaizen. In today's post, lets see what is ZRC (Zoho Request Client) and how we can use ZRC methods in Client Script to get inputs from a Salesperson and update the Lead status with a single button click. In this
    • Kaizen #222 - Client Script Support for Notes Related List

      Hello everyone! Welcome to another week of Kaizen. The final Kaizen post of the year 2025 is here! With the new Client Script support for the Notes Related List, you can validate, enrich, and manage notes across modules. In this post, we’ll explore how
    • Kaizen #217 - Actions APIs : Tasks

      Welcome to another week of Kaizen! In last week's post we discussed Email Notifications APIs which act as the link between your Workflow automations and you. We have discussed how Zylker Cloud Services uses Email Notifications API in their custom dashboard.
    • Kaizen #216 - Actions APIs : Email Notifications

      Welcome to another week of Kaizen! For the last three weeks, we have been discussing Zylker's workflows. We successfully updated a dormant workflow, built a new one from the ground up and more. But our work is not finished—these automated processes are
    • Recent Topics

    • How do teams manage meeting follow-ups across Zoho tools?

      We’re using Zoho tools for collaboration and tracking, but managing meeting notes, action items, and follow-ups across teams is still challenging. Curious how others are handling this within Zoho workflows. Are there best practices or integrations that
    • Zoho Sprint Backlog View, filter by item status

      Hello, In Zoho Sprints, it would be great to be able filter out specific items in the Backlog based on their status. We would like to track items that were Removed from our backlog without seeing them constantly in the Backlog view, as this view should
    • Customize Colors used on graphs and charts according to users desire.

      It would be great if we could customize the graph's colors as we see fit. I hate that yellow is always the default color!
    • Let us view and export the full price books data from CRM

      I quote out of CRM, some of my clients have specialised pricing for specific products - therefore we use Price Books to manage these special prices. I can only see the breakdown of the products listed in the price book and the specialised pricing for
    • Mejoras urgentes para ZOHO MEETING

      Tengo unos meses usando Zoho Meeting. En general, es buena, pero hay cosas vitales que no logra cumplir con mínima calidad. 1) Calidad de audio y video: urge mejoras. Audio con retraso, imagen borrosa, mal recorte de silueta con fondos virtuales. Además,
    • Multiple header in the quote table???

      Hello, Is it possible in Zoho CRM to add multiple headers or sections within the Quote product table, so that when the quote is printed it shows separate sections (for example “Products” and “Services”)? To clarify, I’m asking because: This does not appear
    • Saving sent email campaign as PDF

      I'm looking to add all campaigns sent to an archive folder in sharepoint. Is there anyway to accomplish this in Zoho Flow ? I'm falling at the first hurdle ... can I automatically save a sent campaign as a PDF to a folder location ?
    • Exporting All Custom Functions in ZohoCRM

      Hello, All I've been looking for a way to keep about 30 functions that I have written in Zoho CRM updated in my own repository to use elsewhere in other instances. A github integration would be great, but a way to export all custom functions or any way
    • How can Data Enrichment be automatically triggered when a new Lead is created in Zoho CRM?

      Hi, I have a pipeline where a Lead is created automatically through the Zoho API and I've been trying to look for a way to automatically apply Data Enrichment on this created lead. 1) I did not find any way to do this through the Zoho API; it seems like
    • Conditional Layouts On Multi Select Field

      How we can use Conditional Layouts On Multi Select Field field? Please help.
    • Appreciation to Qntrl Support Team

      We are writing this topic to appreciate the outstanding level of support from Qntrl Team. We have been using Qntrl since 2022 after shifting from another similar platform. Since we joined Qntrl, the team has shown a high level of professionalism, support,
    • How can I hide "My Requests" and "Marketplace" icon from the side menu

      Hello everybody, We recently started using the new Zoho CRM for Everyone. How can I hide "My Requests" and "Marketplace" from the side menu? We don't use these features at the moment, and I couldn't find a way to disable or remove them. Best regards,
    • Whatsapp Integration on Zoho Campaign

      Team: Can the messages from Zoho Campaign delivered through Whatsapp... now customers no longer are active on email, but the entire campaign module is email based.... when will it be available on whatsapp.... are there any thirdparty providers who can
    • Mandatory Field - but only at conversion

      Hello! We use Zoho CRM and there are times where the "Lead Created Date & Time" field isn't populated into a "Contractor" (Account is the default phrase i believe). Most of my lead tracking is based on reading the Lead Created field above, so it's important
    • Different Task Layouts for Subtasks

      I was wondering how it would be possible for a subtask to have a different task layout to the parent task.
    • Enable Free External Collaboration on Notecards in Zoho Notebook

      Hi Zoho Notebook Team, I would like to suggest a feature enhancement regarding external collaboration in Zoho Notebook. Currently, we can share notes with external users, and they are able to view the content without any issue. However, when these external
    • Using data fields in Zoho Show presentations to extract key numbers from Zia insights based on a report created

      Is it possible to use data fields in Zoho Show presentations along with Zoho Analytics to extract key numbers from Zia insights based on a report created? For example, using this text below: (note that the numbers in bold would be from Zia Insights) Revenue
    • Free webinar: AI-powered agreement management with Zoho Sign

      Hi there! Does preparing an agreement feel like more work than actually signing it? You're definitely not alone. Between drafting the document, managing revisions, securing internal approvals, and rereading clauses to make sure everything still reflects
    • WhatsApp Channels in Zoho Campaigns

      Now that Meta has opened WhatsApp Channels globally, will you add it to Zoho Campaigns? It's another top channel for marketing communications as email and SMS. Thanks.
    • CRM For Everyone - Bring Back Settings Tile View

      I've been using CRM for Everyone since it was in early access and I just can't stand the single list settings menu down the left-hand side. It takes so much longer to find the setting I need. Please give users the option to make the old sytle tile view
    • Lets have Dynamics 365 integration with Zohobooks

      Lets have Dynamics 365 integration with Zohobooks
    • Add notes in spreadsheet view

      It would be great if we could Add/edit notes in the spreadsheet view of contacts/leads. This would enable my sales teams to greatly increase their number of calls. Also viewing the most recent note in the Contact module would also be helpful.
    • Opening balances - Accounts Receivable and Payable

      Our accounting year starts on 1st August 2013 and I have a Trial Balance as at that date, including Accounts Receivableand Accounts Payable balances, broken down by each customer and supplier. Q1 - do I show my opening balance date as 31st July 2013 or
    • Announcing Kiosk 1.1 - Customize screen titles, configure new fields & actions, use values from your Kiosk to update fields, and more.

      Hello all We are back again with more enhancements to Kiosk. So what's new? Enhancements made to the Components Add titles for your Kiosk screens and adjust its width to suit your viewing preferences. Three new fields can be added to your screen: Percentage,
    • Limited System because of Limited Number of Fields for Car Dealership

      Dear Zoho Support, we want to have all the information about a car inside of a car record. We want to have Zoho CRM as our single source of truth for our data, but the limited number of fields are not allowing that. The data consist of: technical data
    • Cancel Subscription

      Hi , Im want to cancel my account but without success please help me to do it
    • Making an email campaign into a Template

      I used a Zoho Campaign Template to create an email. Now I want to use this email and make it a new template, but this seems to be not possible. Am I missing something?
    • Direct Access and Better Search for Zoho Quartz Recordings

      Hi Zoho Team, We would like to request a few enhancements to improve how Zoho Quartz recordings are accessed and managed after being submitted to Zoho Support. Current Limitation: After submitting a Quartz recording, the related Zoho Support ticket displays
    • Multiple Cover Letters

      We are using the staffing firm edition of Recruit and we have noticed that candidates cannot add more than one cover letter. This is a problem as they might be applying for multiple jobs on our career site and when we submit their application to a client,
    • URGENT: Deluge issue with Arabic text Inbox

      Dear Deluge Support, We are facing an issue that started on 12/Feb/2026 with custom functions written using Deluge within Qntrl platform. Currently, custom functions do not accept Arabic content; it is replaced with (???) characters. Scenario 1: If we
    • File Conversion from PDF to JPG/PNG

      Hi, I have a question did  anyone every tried using custom function to convert a PDF file to JPG/PNG format? Any possibility by using the custom function to achieve this within zoho apps.  I do know there are many third parties API provide this with
    • Now in Zoho One: Orchestrate customer journeys across apps with Zoho CommandCenter

      Hello Zoho One Community! We’re excited to introduce Zoho CommandCenter as a new capability available in Zoho One. For the whole customer journey As Zoho One customers adopt more apps across sales, marketing, finance, and support, a common challenge emerges:
    • annualy customer report

      we need a report per customer that looks like this invoic number cleaning laundry repair management 01 january xxx euro xx euro xx euro xxx euro 02 february xxx euro xxx euro x euro xxxx euro and so on the years 12 months is that possible to make and
    • Totals for Sales Tax Report

      On the sales tax report, the column totals aren't shown for any column other than Total Tax. I can't think of a good reason that they shouldn't be included for the other columns, as well. It would help me with my returns, for sure. It seems ludicrous
    • Free Webinar: Zoho Sign for Zoho Projects: Automate tasks and approvals with e-signatures

      Hi there! Handling multiple projects at once? Zoho Projects is your solution for automated and streamlined project management, and with the Zoho Sign extension, you can sign, send, and manage digital paperwork directly from your project workspace. Join
    • Exported Report File Name

      Hi, We often export reports for information. It is time consuming to rename all the reports we export on a weekly basis, as when exported their default name is a seemingly random string of numbers. These numbers may be important, I'm not sure, but I am
    • Automatic Refresh on Page?

      Hi everyone, We use a page as a dashboard which shows data for the laboratory and tasks pending etc. Is there a way to set the page to automatically refresh on a X time? Many thanks TOG
    • How do I edit the Calendar Invite notifications for Interviews in Recruit?

      I'm setting up the Zoho Recruit Interview Calendar system but there's some notifications I don't have any control over. I've turned off all Workflows and Automations related to the Calendar Scheduling and it seems that it's the notification that is sent
    • Add RTL and Hebrew Support for Candidate Portal (and Other Zoho Recruit Portals)

      Dear Zoho Recruit Team, I hope you're doing well. We would like to request the ability to set the Candidate Portal to be Right-to-Left (RTL) and in Hebrew, similar to the existing functionality for the Career Site. Currently, when we set the Career Site
    • App for Mac OS X please!

      It would be awesome to have a mail app for Mac OS X that included all the cool features such as steams, calendar, tasks, contacts, etc. Most people prefer native apps, rather than running it through a web browser. I know that we can use the IMAP, CalDAV,
    • Next Page