Issue Summary

Users who have added themselves as watchers to a calendar are not receiving email notifications for changes in the calendar. .

Steps to Reproduce

1. Navigate to a space.
2. Go to the Calendar tab.
3. Add yourself as a watcher to the calendar.
4. Add a new event in the calendar
5. Observe whether an email notification is received.

Expected Results

Watchers should receive an email notification whenever there is an update or change in the calendar they are watching.

Actual Results

No email notifications are received by the watchers of the calendar.

Workaround

Users can watch the entire space to receive email notifications or a page that has the calendar embedded.