Record event attendance state by contact ID
One step with HubSpot. We can help you get access.
Get something done
Record event attendance state by contact ID
with HubSpot
Works with AI assistants
Use HubSpot: its Marketing Marketing Events Subscriber State Changes API lets you record event attendance state by contact ID in a single step (POST /marketing/marketing-events/2026-09/events/{externalEventId}/{subscriberState}/upsert). HubSpot also has an MCP server, so an AI assistant like Claude or ChatGPT can do it for you. capabilities.work can help you get signed up and connected.
- Can I record that contacts cancelled or attended an event when I only have their HubSpot contact IDs?
- Does the ID-based subscriber state update require the contacts to already exist?
Say it to your AI assistant
- Set contact IDs {inputs} to {subscriberState} for event {externalEventId} in account {externalAccountId}.
- By contact ID, mark {inputs} as {subscriberState} on marketing event {externalEventId} for account {externalAccountId}.
For your developer
POST /marketing/marketing-events/2026-09/events/{externalEventId}/{subscriberState}/upsert in Marketing Marketing Events Subscriber State Changes API. Full spec on APIs.io.