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

    • Urgent Zoho Creator down!!!???

      Now my zoho creator faced this issue. Anyone has idea? Urgent!!!

    • The Social Wall: September 2025

      Hello everyone, As we step into the fall season, some major updates are on the horizon. Meanwhile, here are the exciting updates we rolled out this September. Approvals in iOS Managing approvals just got more seamless on mobile. With this update, the

    • Introducing Detailed View for Candidates in Vendor Portal

      We’ve added a new Details sub-tab inside the Vendor Portal to help vendors easily view complete candidate information after submission. With this update, vendors can now access all candidate details, from personal information to associated job openings,

    • Zoho One Down

      Zoho Team, Checking if when the services up - currently Zoho One is down

    • How can I track which zoho users are actively using Zoho CRM

      I have several licenses of Zoho CRM. We now need to add a new user. I could purchase a new license, but before I do, I would like to see if any of our existing users are not actively using the license assigned to them. How can I determine the activity

    • Access to Detail View From HTML Snippet

      Zoho Creator displays a detail view that slides out from the right onClick of a record in a report. Am I able to access that detail view from an html snippet, e.g. click a record in a list and display the detail view? The zc_LoadIn dialog is a bit clunky,

    • Billing Management: #10 Solving Common Mistakes in Billing

      Over the past few weeks, we have explored different facets of billing, from the simplicity of traditional one-time billing to the evolving landscape of subscriptions, retainers, and usage-based models. We've unpacked how billing isn't just about sending

    • 【開催間近 - 10/17】東京 ユーザー交流会 Vol.3 参加登録 受付中！(参加無料)

      ユーザーの皆さま、こんにちは。コミュニティチームの藤澤です。 10/17(金)に、東京・新橋で「東京 ユーザー交流会 Vol.3」を開催します！ ZOHOLICSよりも小規模なイベントですので、「リアル開催はちょっと緊張する…」という方も、安心してご参加いただけます✨ 当日は、初公開の事例を2つご紹介予定です！ なお、セッション映像のアーカイブ配信は予定していないため、会場にお越しいただいた方だけが、登壇者へ直接質問したり、リアルな声を聞いたりできる貴重な機会となっています。 ーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーー

    • Loading CSS Stylesheets into HTML Snippet

      Combining html/css into a single snippet can grow quite large for a UI that has a lot of functionality/styling. To keep things tidy, are we able to pull files into an html snippet using a <link> tag? If so, what are some best practices?

    • Notes Attachments

      Two things it would be nice to have the attachment size the same as the attachments sections and it would be nice to be able to attach links like you can in the attachments section. Thank you

    • Canvas: empty images

      Hello. If I add an image field like contact photo in a Canvas design, and the field is empty, there is an ugly placeholder in its place. This doesn't happen in the standard view. In the standard view, if the contact photo is empty, nothing appears in

    • Google enhanced conversions not working

      Hi guys, I've connected Zoho CRM through Google Ads interface with the goal to setup the enhanced conversion tracking in Google Ads. I have to Zoho related conversion goals which you can see in the images below: For the conversion goal above I've setup

    • MS Teams Meeting to Zoho CRM

      Has anyone figured out a good way to push MS Teams meeting info on a trigger of "meeting end" to Zoho CRM? We're looking for a way to take attendees of a meeting and meeting duration and push it into Zoho CRM after the meeting has ended. If I can just

    • Font Size 11 - Zoho CRM Email Templates

      Our company communicates with our vendors exclusively using Calibri Font Size 11, as this is the standard formatting for professional emails. Since the CRM only allows for the selection of font sizes 10 & 12, we have been unable to utilize the CRM email

    • Subforms in stateless forms

      I think the title says it all. We need to be able to add subforms to stateless forms. Currently the only workaround is to create a Form and delete each record upon submission of the form. I need to build an interface to update our inventory. Basically

    • Calling Function via REST API with API Key gives 401 using Zoho Developer

      Hi, I created a couple of functions using the one month trial of Enterprise edition, which I was able to call using the API Key method from Postman and from an external site. Now that my trial has expired, I have created the same functions in the Developer

    • How do I move a section or element from one page to another in the NEW Zoho Sites UI

      I have a section on my home page with numerous elements within it and I'd like to move the entire section to a different page on my site so I don't have to recreate it from scratch.  Is there a way for me to do that easily? I could use a quick answer on this please.

    • Zoho Projects app update: Global Web Tabs support

      Hello everyone! In the latest version(v3.10.10) of the Zoho Projects app update, we have brought in support for Global Web Tabs. You can now access the web tabs across all the projects from the Home module of the app. Please update the app to the latest

    • Export as MP4 or GIF

      Hi, Just wondering if there's a way to export/convert a presentation to an MP4 video file or even a GIF. One use case would be to use the animation functionality to create social media graphics/charts/gifs/videos. Thanks for a great tool... Rgds Jon

    • Page Layout- Horizontal Rule

      When editing the layout of, for instance, the Potentials page, is there a way to insert a horizontal rule or white space in between fields?  I'd like to keep a group of fields in the same Section, but would like to create some seperation in order to further group together certain fields within the Section.  If this is not possible, does anybody have any other suggestions on how to create this same effect?   Thank you!

    • Zoho Books will discontinue support for older browser versions soon

      Hello users, Starting from May 15, 2024, Zoho Books will no longer support the following browser versions: Browsers Version Restrictions Firefox Browser Versions older than 100 Google Chrome Versions older than 100 Microsoft Edge Versions older than 100

    • Zoho Projects - Q3 Updates | 2025

      Hello Users, The final quarter of the year 2025 has begun, and we at Zoho Projects are all set with a plan. New targets to achieve and new milestones to reach, influenced by the lasting imprint of the past quarter. 2025's Q3 saw some new features and

    • Zoho Sheet - Printing - Page Breaks and Printing Customization

      I think the title is descriptive enough in that I cannot find help documentation on a simple task of adding in page brakes for separating pages on print. Thanks

    • Issue with Trident exe file

      Hello Team, Exe Setup file It's showing harmful for user pc please check and do needful. this message for developer team. Thanks Bhargav Purohit

    • Different languages for users

      Hello, Do you plan to enable individual users to select their languages for interface? Currently language can be changed for everyone - it looks like a settings for a whole portal, which is not good when you are working internationally. Best regards,

    • Transaction Locking with the dynamic date

      Is it possible to dynamically update dates on transaction locking. We want to lock transaction x days from today

    • Unable to change sales_order status form "not_invoiced" to "invoiced"

      I am automating process of creating of invoice from sales_orders by consolidated sales_orders of each customer and creating a single invoice per customer every month. I am doing this in workflow schedule custom function where i create invoice by getting

    • Apply Vendor Credits Automatically

      We are bulk importing Vendor credits in Zoho Books!!! Is there a way to apply vendor credits automatically to the first UNPAID bill of the Vendor?

    • Apply Vendor Credit Automatically

      Hello!!! Is there a way where in we can apply vendor credits automatically on the FIRST OUTSTANDING BILL of the vendor?? We have lots of VENDOR CREDITS ISSUES mostly!!! Applying it manually is a pain for us. Would be great if we have a way to apply the

    • Need Easy Way to Update Item Prices in Bulk

      Hello Everyone, In Zoho Books, updating selling prices is taking too much time. Right now we have to either edit items one by one or do Excel export/import. It will be very useful if Zoho gives a simple option to: Select multiple items and update prices

    • Creator problem: Edit form View not displaying whole form

      I'm having problems with the form in my database. The edit view is not showing the whole form: This is how it looks in the normal view: As you can see, there is a whole section in the bottom right of the form which is not displaying in the Edit View. This means that I can't change or delete any of these fields... Anybody had a similar problem or know a solution? Any help would be appreciated.   Cheers,

    • Vendor Master Enhancements for Faster Purchase Entry

      I’d like to suggest a few features that will improve accuracy and speed during purchase voucher entry: Automated Item Tax Preference in Vendor Master Add an option to define item tax preference in the vendor master. Once set, this preference should automatically

    • Quick Item Search & Auto-suggestion for Invoices

      Hi Team, I am facing an issue while creating invoices in Zoho Books. Currently, I have to type the full item name in the correct sequence and spelling for it to appear. For example, my item name is: "Distemper Acri Silk Special White 10kg" If I type something

    • Function #53: Transaction Level Profitability for Invoices

      Hello everyone, and welcome back to our series! We have previously provided custom functions for calculating the profitability of a quote and a sales order. There may be instances where the invoice may differ from its corresponding quote or sales order.

    • Integrating Chatbot with Zoho Creator Application

      Is it possible to integrate a chatbot with a Zoho Creator application?

    • Average Costing / Weighted Average Costing

      Hello fellow maadirs. I understand Zoho Books uses FIFO method of dealing with inventory costing, but do you guys have any plans to introduce average costing? We indians need average costing. It's part of our culture. Please. I beg thee. Thanks.

    • 'Add Tax To Amount' not reflected in Invoice

      Hi Zoho Support, I'm experiencing an issue with tax calculation display in my invoice template. Despite having "Add tax to amount" box checked in the template settings, the Amount column is not showing the tax-inclusive total for line items. Current behaviour:

    • "Subject" or "Narration"in Customer Statement

      Dear Sir, While creating invoice, we are giving in "Subject" the purpose of invoice. For Example - "GST for the month of Aug 23", IT return FY 22-23", "Consultancy", Internal Audit for May 23". But this subject is not coming in Customer Statement. Only

    • A real WYSIWYG field instead of the limited rich text

      Hi to everyone A "real" WYSIWYG or HTML field that outputs good HTML code when accessed through the API would be excellent. I tried to use the rich text field, but the styling options are limited. For example, there are no heading tags (h1 to h6), and

    • Delete my store of Zoho commerce

      Hi Team, I want to delete my stores of commerce. Please help me asap. Looking for the positive response soon. Thanks Shubham Chauhan Mob: +91-9761872650

    • Next Page