Audit Log
The Calendar audit log feature is available since version 4.2.0 on Data Center/Server. It helps increase transparency in the changes made to calendars. The log displays the following types of events:
Who created events
When an event was created
Who modified an event
Who changed the time of an event
Who modified a calendar
Whether a reminder was sent for an event
When a reminder was sent for an event
The Calendar Change Log does not display any changes made to tasks. These changes can always be found in the activity log of the task itself.