RSVPs

Create and update rsvps with complete curl request examples.

Collection path: events/{event_id}/rsvps

Input	Type	POST	PATCH	Notes
`timeslot_id`	Scalar ID	Used	Ignored	Session must belong to the event and accept attendance registrations.
`registrant_id`	Scalar ID	Used	Ignored	Registrant must belong to the event.
`checked_in_at`	ISO 8601 string or `null`	Ignored	Optional	`null` clears check-in.

Sponsor-restricted scopes may create or patch RSVPs only for sessions that the selected sponsor owns as main sponsor or session sponsor.

POST an RSVP

curl --request POST \
  --url "${BRELLA_API_BASE_URL}/api/core/organizations/${BRELLA_ORGANIZATION_ID}/events/${BRELLA_EVENT_ID}/rsvps" \
  --header "Accept: application/vnd.brella.v4+json" \
  --header "Brella-API-Access-Token: ${BRELLA_API_ACCESS_TOKEN}" \
  --header "Content-Type: application/json" \
  --data-raw '{
    "timeslot_id": 5501,
    "registrant_id": 1201
  }'

The attendance-registration service preserves capacity checks and creates the corresponding bookmark as a side effect. The response type is rsvp; useful write-response fields include timeslot_id, registrant_id, checked_in_at, and updated_at.

PATCH an RSVP

curl --request PATCH \
  --url "${BRELLA_API_BASE_URL}/api/core/organizations/${BRELLA_ORGANIZATION_ID}/events/${BRELLA_EVENT_ID}/rsvps/9201" \
  --header "Accept: application/vnd.brella.v4+json" \
  --header "Brella-API-Access-Token: ${BRELLA_API_ACCESS_TOKEN}" \
  --header "Content-Type: application/json" \
  --data-raw '{
    "checked_in_at": "2026-09-03T09:02:00Z"
  }'

Clear the check-in timestamp with:

{
  "checked_in_at": null
}