How to know who updated an event?

There are two ways to track who has added or edited calendar events.

1. The event popup can display the user who last updated an event.  To set this option, login as Administrator, go to Admin Menu, click on Options.  Under the Advanced Options tab, check the box "Show user who last updated...".  The user will then appear at the bottom of all event popup descriptions
2. Email notification of event additions and edits can also be sent by entering an email address in the Advanced Options tab and then checking the "Send notice when new event is added / edited" check box.  An email will be sent to the email address when any event is added or edited.