# [2021-07-27] Event meatadata

Source: https://developer.nylas.com/docs/new/v2-release-notes/2021-07-27-event-metadata/

Event Metadata is now out of beta!

Event metadata lets you attach key-value pairs to event objects. Use it to store information such as customer ID, internal event data, and other information. Review our Event Metadata [documentation](/docs/dev-guide/metadata/) to get started.

```json
{
  "account_id": "{account_id}",
  "busy": true,
  "calendar_id": "{calendar_id}",
  "description": "Let's Party!!!",
  "ical_uid": null,
  "id": "6ndts0aut32bzrfd9dmzma1fr",
  "job_status_id": "{job_status_id}",
  "location": "Roller Rink",
  "message_id": null,
  "metadata": {
    "event_type": "birthday",
    "internal_event_id": "b55469dk",
    "number_of_guests": 55
  },
  "object": "event",
  "owner": "Albert Einstein <al@example.com>",
  "participants": [
    {
      "comment": null,
      "email": "tom@example.com",
      "name": "Thomas Edison",
      "status": "noreply"
    }
  ],
  "read_only": false,
  "status": "confirmed",
  "title": "Birthday Party",
  "when": {
    "end_time": 1615334400,
    "object": "timespan",
    "start_time": 1615330800
  }
}
```