Subscription calendars are calendars that you create (and share) via the AddEvent Dashboard. Each calendar can contain multiple events, and your users can subscribe to these calendars to add all of the events contained within their personal calendars. When your users subscribe, they become 'subscribers', and a dynamic connection is created between their personal calendars and the AddEvent calendar you created. This means that when you add, delete or change an event in the AddEvent calendar you've created, that change will be reflected (after a short delay) on the personal calendars of that calendar's subscribers.