Users want to know why they are receiving email notifications from Team Calendars

UI Ticket here [UI-1284|See https://extranet.atlassian.com/jira/browse/UI-1284]

Here's the problem:
A user can be watching a calendar if that calendar is embeded in a page they are watching. If an event gets added to a calendar embedded in a page they are watching, they get an email notification that looks something like this:

They go to look at the calendar and see there's no watch on it:

Ideally the email notification would indicate why they're receiving that notification.

As an added benefit, the user might be able to go to an "information" tab about the calendar to see what pages that calendar is embedded into.