When a member of your calendar adds or edits an event or a comment, you can find the changes made in the following three places.
1) A red dot will appear next to the calendar that has been changed/edited/updated.
2)‘Side Menu’ Section
An “N” mark will appear within the Side Menu when a change has been made.
3) 'Feed' section
You will find all changes made to your comments, shared calendar, and events in your Feed section.