Event Attendees

Record Participants by ContactId with Marketing Event External Ids

Records the participation of multiple HubSpot contacts in a Marketing Event using their HubSpot contact IDs.

Additional Functionality:

Allowed Properties: For the state "attend":

post/marketing/marketing-events/2026-09/attendance/{externalEventId}/{subscriberState}/create

Request

Base URL
https://api.hubapi.com
URL
https://api.hubapi.com/marketing/marketing-events/2026-09/attendance/{externalEventId}/{subscriberState}/create
Auth
OAuth 2
Authorization code: https://app.hubspot.com/oauth/authorize
Token URL: https://api.hubapi.com/oauth/v1/token scopes: crm.objects.marketing_events.write

externalEventIdstring required

The ID of the marketing event in the external event application.

subscriberStatestring required

The state of the subscriber's attendance, such as 'register', 'attend', or 'cancel'.

externalAccountIdstring

The account ID associated with the marketing event in the external event application.

successful operation

completedAtstring date-time required

Timestamp that represents when the request finished processing

linksobject

Result of the request

numErrorsinteger

The number of errors that occurred during the processing

requestedAtstring date-time

Timestamp that represents when the request was made

startedAtstring date-time required

Timestamp that represents when the request started processing

status'CANCELED' | 'COMPLETE' | 'PENDING' | 'PROCESSING' required

The status of the request processing