# Events

Smartsheet uses event objects to capture actions such as creating, updating, loading, deleting, and more for items such as sheets, reports, dashboards, attachments, and users. With **Event Reporting**, you can use the operations described here to programmatically retrieve these events.

> **Note:** Event Reporting is a premium add-on available for Enterprise and Advanced Work Management plans only. For details on the add-on, please contact our <a href="https://www.smartsheet.com/contact/sales" target="_blank" rel="noopener noreferrer">Sales Team</a>.

<h2>Event types</h2>

All events derive from the [Event](/api/smartsheet/openapi/events/event) schema. Each event type overrides Event's `objectType` and `action` properties with its specific object type and a typical action performed on that object. Furthermore, each event type's `additionalDetails` object has properties specific to the event type.

See [Event types](/api/smartsheet/event-types.md) for the complete event listing, details, and example objects.

<h2>System users</h2>

System components perform some actions in Smartsheet. Therefore,
the `userId` property in some response payloads refers to a system user--not to a regular user. For example, the Smartsheet Events API shows
5629504736520068 as the `userId` when an anonymous user accesses a sheet
that is published for anyone.

The system users are listed below. New system `userIds` may be
incorporated to this list as new features and subsystems are incorporated
to Smartsheet:

System user | Description |
-----|-----|
1688855062570884 | Data accessed/modified by Skype action (only possible if Smartsheet account is connected to Skype) |
2814754969413508 | Data accessed/modified by Trello import action (only possible if Smartsheet account is connected to Trello) |
3377704922834820 | Data accessed/modified due to Smartsheet cell-link |
3940654876256132 | Data accessed/modified by the Smartsheet Automation system |
5066554783098756 | Access to object published to any user in the Smartsheet organization account |
5629504736520068 | Access to Smartsheet object published to anyone |
6192454689941380 | Data accessed/modified by the Smartsheet Notification system |
7881304550205316 | Data accessed/modified by Smartsheet Form submission |