Create occured event
Let's start by creating a recurring event.
POST https://graph.microsoft.com/v1.0/me/events
{
"subject": "Let's go for lunch",
"body": {
"contentType": "HTML",
"content": "Lunch time"
},
"start": {
"dateTime": "2025-05-26T12:00:00",
"timeZone": "Central Europe Standard Time"
},
"end": {
"dateTime": "2025-05-26T12:30:00",
"timeZone": "Central Europe Standard Time"
},
"recurrence": {
"pattern": {
"type": "daily",
"interval": 1
},
"range": {
"type": "endDate",
"startDate": "2025-05-26",
"endDate": "2025-05-30"
}
},
"location":{
"displayName":"Pub"
},
"attendees": [],
"allowNewTimeProposals": true
}
The response contains the id which is the unique identifier of the master series.
Get cancelled occurrences and exceptional occurrences
Now in Outlook, I will cancel the event on 5/29/2025 and change the start time of the event on 5/28/2025.
Recently, Microsoft Graph API has added the ability to get cancelled and exceptional occurrences of a recurring event. You can use the cancelledOccurrences property and the exceptionOccurrences relationship.
First of all, you need to specify the exceptionOccurrences and cancelledOccurrences in the $select query parameter and you need to expand the exceptionOccurrences.
GET https://graph.microsoft.com/v1.0/me/events/{masterSeries_id}?$select=subject,start,end,occurrenceId,exceptionOccurrences,cancelledOccurrences&$expand=exceptionOccurrences
The response
{
"id": "AAMkAGRkZTFiMDQxLWYzN...i2ZIVhDiHAAq5zGN4AAA=",
"subject": "Let's go for lunch",
"cancelledOccurrences": [
"OID.AAMkAGRkZTFiMDQxLWYzN...i2ZIVhDiHAAq5zGN4AAA=.2025-05-29"
],
"start": {
"dateTime": "2025-05-26T10:00:00.0000000",
"timeZone": "UTC"
},
"end": {
"dateTime": "2025-05-26T10:30:00.0000000",
"timeZone": "UTC"
},
"exceptionOccurrences": [
{
"id": "AAMkAGRkZTFiMDQxLWYzN...mSFYQ4hwAKucxjeAAAEA==",
"subject": "Let's go for lunch",
"start": {
"dateTime": "2025-05-28T09:30:00.0000000",
"timeZone": "UTC"
},
"end": {
"dateTime": "2025-05-28T10:00:00.0000000",
"timeZone": "UTC"
}
}
]
}
As you can see, the exceptionOccurrences is a list of events that are exceptions to the master series, and the cancelledOccurrences contains the occurrenceId property values of canceled instances in a recurring series.
What if you want to get details about the cancelled occurrences?
You can parse the date from the occurrenceId which has the following format: OID.{masterSeries_id}.{date}. The date is in the format yyyy-MM-dd, so you can get only the date when the occurrence was cancelled.
