Seasons with events that have changes or have been edited will appear in the queue as links (blue font and underlined) if Record Edit History Before/After Publishing box has been checked.

Click on the Season that appears as link to get into the list of Edited Events. These links are only available to the admin area; they do not show on the public view of the calendar. 

Click on the event you want to view the edit history. Events that are crossed (with red lines over it) had been deleted.

Changed/edited fields in the event appear in red. The original version of the event appears on the bottom and traces the history of changes moving up. Every update made to the event is represented by a box showing the changes made. The original version is inside the Original box, and the current version is inside the Current box. You can see who made the changes and when on the upper left side of every box.