Getting notifications about changes in a calendar
It is possible to get a notification email every time an event is changed, modified or deleted in a shared calendar (it works only for shared calendars, i.e. calendars that are listed under “Other calendars”). To activate this feature in Google Calendar, open the calendar’s “Notifications” page (click the gear icon in the upper right corner, then “Calendar settings”, “Calendars” (tab), “Notifications” (behind the name of the shared calendar)):
By checking “New invitations”, “Changed invitations” and “Canceled invitations” in the “Email” column you can activate the notification emails.