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!


















        • Recent Topics

        • Collective-booking event not added to all staff calendars

          We assign two staff to certain events. When the client books this event, it adds it to one staff calendar (the 'organiser') but not the other. How can I ensure all staff assigned to a collective booking get the event in their calendar? (A side note: it
        • Project Management Bulletin: October, 2025

          Every need leads to innovation. Project Management tools were developed out of sheer necessity to drive large projects. With wide usage, the specifications grew precise, and so did the refinement. Over years we’ve crafted one of the best project management
        • Zoho Sheets saying locked when not locked

          Zoho Sheets won't let me add more rows to sheet because it's saying the sheet is locked, but the sheet is not locked. I tried using a different browser but I still have the same issue.
        • Identifying and Merging Accounts with Similar (Non-Exact) Names

          Hello everyone, I’m aware of the built-in deduplication feature in Zoho CRM that allows merging records with exactly matching values for selected fields. However, I’m running into a situation where our migrated data contains multiple variations of the
        • Option for super admin to recover the deleted chats in Zoho Cliq

          Currently, in Zoho Cliq, if a user accidentally deletes their chats, there is no option for the Super Admin to recover or view those deleted messages. I believe it would be helpful if Super Admins had a recovery option, perhaps within a certain time frame,
        • Zoho CRM iOS app updates: the Homepage, Zoho Survey integration, and support for multiple file uploads in subform

          Hello everyone! The Zoho CRM mobile app continues to evolve to bring you a smoother and more powerful CRM-on-the-go experience. We're excited to share some important updates now available in the iOS app. Here's what's new: Homepage support Zoho Survey
        • I am trying to integrate my module in sandbox environment to add data via API

          I went through the documents and tried to setup the API for adding the module via the api but the problem is the token setup is done on "https://accounts.zoho.in/oauth/v2/token" domain and the bulk write is done on "https://content.zohoapis.com/crm/v8/upload"
        • Setting up primary mobile number.

          Hi Sir Earlier I joined IIFL team and got an organizational email of zoho services. Later i quit and now my account is deactivated with IIFL but i am unable to link my mobile number to my own email id with zoho.
        • Add Custom Reports To Dashboard or Home Tab

          Hi there, I think it would be great to be able to add our custom reports to the Home Tab or Dashboards. Thanks! Chad
        • Zoho sheet for desktop

          Hi is zoho sheets available for desktop version for windows
        • Tables for Europe Datacenter customers?

          It's been over a year now for the launch of Zoho Tables - and still not available für EU DC customers. When will it be available?
        • Guided Conversations - Ticket Creation

          Hi there, Using Guided Conversations to Take Customer Data and apply it into a Support Ticket for internal use, Is there a way to take multiple Textual Variables Inputs (A series of questions), and have the answers all appear in the Description of the
        • How to send certain invoices for Approval based on condition?

          To streamline operations, I need the invoices to go for approval when certain conditions are met. For example, if my staff gives a discount of x amount, it must go for approval. If there is no discount, then the invoice will be approved automatically.
        • Unable to continue payment

          Hi, I want to make a payment for my email subscription, but I cannot proceed with the payment because my NITKU is invalid. In Indonesia, the NITKU consists of 22 digits, but Zoho only provides 20 digits, causing my NITKU to be invalid. Please help me
        • Is there a way to show contact emails in the Account?

          I know I can see the emails I have sent and received on a Contact detail view, but I want to be able to see all the emails that have been sent and received between all an Accounts Contacts on the Account Detail view. That way when I see the Account detail
        • Massive spam pretending to come from our address – is this a Zoho security issue?

          Hi, We’ve been receiving more and more suspicious emails lately — many of them clearly look like scams. But yesterday, we got an email that appeared to be sent from our own address, which was very concerning. We're starting to wonder if this might be
        • Cant recieve mails

          I’m having an issue with my external IMAP account not fetching any emails into Zoho Mail, even though the connection test says “Success”. I can send, if someone sends an email to me. my original directory (home.pl host) recieves it in their portal but
        • Zoho Sheet Autofit Data

          While using Autofit Data function in Zoho Sheets with Devnagri Maratji or Hindi Fonts, a word or a number, it keeps couple of characters outside the right side border.
        • Enhancements to finance suite integrations

          Update on the migration (October 28, 2025): Starting this week (October 29 tentatively), we’ll begin migrating Zoho CRM users to Zoho Books as integration users. This means actions will now run under each user’s own Zoho Books access, instead of the admin’s.
        • Edit 'my' Notes only

          The permissions around Notes should be more granular, and allow to user to be able to edit the notes he created only. The edit Notes permission is useful as it allows the user to correct any mistakes or add information as needed. However, with this same
        • How do I filter contacts by account parameters?

          Need to filter a contact view according to account parameter, eg account type. Without this filter users are overwhelmed with irrelevant contacts. Workaround is to create a custom 'Contact Type' field but this unbearable duplicity as the information already
        • Job Alerts for Candidates

          hi All, I have 2 questions relating to sharing job details with candidates. 1. is there a way to notify candidates that meet certain criteria of current jobs available? eg. I run a candidate search, and identify 50 candidates that might be suitable. Can
        • Add multiple users to a task

          When I´m assigning a task it is almost always related to more than one person. Practical situation: When a client request some improvement the related department opens the task with the situation and people related to it as the client itself, the salesman
        • Enhancing Task Accuracy: Automatically notify the owners upon Task duplication.

          Hello Everyone, A Custom function is a user-written set of code to achieve a specific requirement. Set the required conditions needed as when to trigger using the Workflow rules (be it Tasks / Project) and associate the custom function to it. The requirement
        • Show/ hide specific field based on user

          Can someone please help me with a client script to achieve the following? I've already tried a couple of different scripts I've found on here (updating to match my details etc...) but none of them seem to work. No errors flagged in the codes, it just
        • Where are Kanban swimlanes

          So i've been playing with Zoho Projects Kanban view a bit more. It appears that task lists are being used as the Kanban columns, which makes sense from the implementation point of view but not the logical one.  Kanban columns are statuses that a task can flow through, while a task list has been a logical way to organize related tasks and relate them to a mislestone. In other words a task in a particular task can go through several stages while remaining in the same task list. After doing some research
        • Tip 19: How to display images in Pages using ZML snippets

          Hi folks, We're back with another tip on how to use Zoho Markup Language (ZML) to create interactive pages in Zoho Creator. You can use ZML snippets to add various kinds of components to your pages and structure them in meaningful ways. That's not all, though—using ZML you can ensure your application is automatically compatible with all kinds of devices without any inconsistencies. We often get questions from users about how to invoke Deluge scripts within ZML code. Here's a simple use case for adding
        • Can zoho swign format block text spacing automatically when prefilled from zoho crm?

          I'm sending zoho sign template from zoho crm, so that zoho crm pre-populates most fields. I have existing pdf documents that i am having signed. I have no ability to change the pdf documents, they are standardized government forms. The problem I am facing
        • Forced Logouts - Daily and More Frequent

          In the last month or so, I've been getting "power logged out" of all of my Zoho apps at least daily, sometimes more frequently. This happens in the same browser session on the same computer, and I need to re-login to each app separately after this happens.
        • Zoho Inventory / Finance Suite - Add feature to prevent duplicate values in Item Unit field

          I've noticed that a client has 2 values the same in the Unit field on edit/create Items. This surprised me as why would you have 2 units with the same name. Please consider adding a feature which prevents this as it seems to serve no purpose.
        • Reference lookup field values in Client script

          hello all, I'm using a "ZDK.Apps.CRM.Products.searchByCriteria" function call, which is returning the matching records correctly; however, one of the fields is a lookup field which I need the associated data. I believe there is a way to get this data
        • In App Auto Refresh/Update Features

          Hi,    I am trying to use Zoho Creator for Restaurant management. While using the android apps, I reliased the apps would not auto refresh if there is new entries i.e new kitchen order ticket (KOT) from other users.   The apps does received notification but would not auto refresh, users required to refresh the apps manually in order to see the new KOT in the apps.    I am wondering why this features is not implemented? Or is this feature being considered to be implemented in the future? With the
        • Every time an event is updated, all participants receive an update email. How can I deactivate this?

          Every time an event is updated in Zoho CRM (e.g. change description, link to Lead) every participant of this meeting gets an update email. Another customer noticed this problem years ago in the Japanese community: https://help.zoho.com/portal/ja/community/topic/any-time-an-event-is-updated-on-zohocrm-calendar-it-sends-multiple-invites-to-the-participants-how-do-i-stop-that-from-happening
        • How can I filter a field integration?

          Hi,  I have a field integration from CRM "Products" in a form, and I have three product Categories in CRM. I only need to see Products of a category. Thanks for you answers.
        • How to implement new online payment gateway?

          Hello, Can you tell me how to proceed to implement my local payment gateway? DIBS has an open avaiable API that should be easy to implement into ZOHO BOOKS. http://tech.dibspayment.com/dibs_payment_window
        • Zoho CRM - Portal Users Edit Their Own Account Information

          Hi Community, I'm working on a client portal and it seems like the only I can make the Account record editable to the Contact, is if I add another lookup on the Account to the Contact record. Am I missing something as the account already has a list of
        • I’ve noticed that Zoho Sheet currently doesn’t have a feature similar to the QUERY formula in Google Sheets or Power Query in Microsoft Excel.

          These tools are extremely helpful for: Filtering and extracting data using simple SQL-like queries Combining or transforming data from multiple sheets or tables Creating dynamic reports without using complex formulas Having a Query-like function in Zoho
        • Connecting Zoho Mail with Apollo.io

          Hi, I am trying to connect my Zoho Mail account with my Apollo.io account to start sending cold email for prospecting purposes. I have activated the IMAP setting but I am still unable to connect to the Apollo account. I am using my email credentials but
        • Where does this report come from in the Zoho One ecosystems?

          Is this directly from MA, Analytics or ??? ???
        • Contact's title in "Contact Role Mapping"

          When I'm creating a deal, I'd like to see the contacts title in the listing. Right now, I only see this: How can I get the contact's title in there?
        • Next Page