Using the Event Audit Trail
An Audit Trail is kept of all changes to events which allows you to trace any updates done by anyone to any of the events whether through bulk import, via the planning board or manually.
To access the audit trail use the "Audit" tab from the Event Detail page as shown below:

Opening the audit trail shows a list of all the changes to your event in reverse chronological order (most recent at top):
Clicking on Details beside an Audit Entry will show you the changes made during that particular Audit Entry in a diff view - you can see the data held about the Event before the change and after the change with the portions that were updated highlighted for easy reference:
