# Registration.attended

URL: /business/events/Registration.attended · Id: `event:Registration.attended`

> Emitted each time a Registration is attended.

[Registration.attend](/business/nouns/registration/attend) emits `Registration.attended` when it completes on a [Registration](/business/nouns/registration).

| Property | Value |
| --- | --- |
| Emitted by | [Registration.attend](/business/nouns/registration/attend) |
| Noun | [Registration](/business/nouns/registration) |
| Moves | [Registration](/business/nouns/registration) `registered` to `attended` |
| Wakes | None. |

### Payload
Each delivery is an [Event](/business/nouns/event) record. `data` holds what [Registration.attend](/business/nouns/registration/attend) returns, and `previous` holds the state it left.

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `name` | `string` | Yes | `Registration.attended`. |
| `at` | `datetime` | Yes | When it happened. |
| `seq` | `integer` | No | Its position in the namespace, one more than the Event before; any seq is a cursor into the history. |
| `data` | `json` | Yes | The Thing as the Action left it. |
| `data.registration` | [Registration](/business/nouns/registration) | Yes | The Registration, now `attended`. |
| `data.registration.status` | `string` | Yes | One of `invited`, `requested`, `waitlisted`, `registered`, `attended`, or `noShow`. |
| `data.registration.registeredAt` | `datetime` | No | When the place was confirmed. |
| `data.previous.status` | `string` | Yes | The `status` before this Event: `registered`. |

### Example
```json
{
  "$id": "https://api.sb/patentpad.com/events/event_1",
  "$type": "Event",
  "name": "Registration.attended",
  "at": "2026-10-22T12:00:00Z",
  "data": {
    "registration": {
      "$id": "https://api.sb/patentpad.com/registrations/registration_1",
      "$type": "Registration",
      "status": "attended",
      "registeredAt": "2026-10-22T12:00:00Z"
    },
    "previous": {
      "status": "registered"
    }
  },
  "seq": 1
}
```