There are two ways to track who has added or edited calendar events. Login as administrator and go to:
Admin Menu > under Calendar Settings > Calendar Options > Expert Options Tab > Event Change Tracking
- Enter email address(es) to the "email address to receive change notices" field to set up automatic email notifications of event additions, deletions and edits by entering > Save
- Optionally, check the box "Show user who last updated..." > Save
The user whom added or last updated the event will then appear at the bottom of all event popup descriptions.