To share multiple events at once using an add-to-calendar button, add-to-calendar links, or another sharing method, you should use a subscription calendar. The subscription calendar allows a user to add multiple events to their calendar at once by subscribing to a single calendar, without needing to individually save multiple separate events to their calendar.
Subscription calendars also create a dynamic link between your users’ calendars and AddEvent. This means that any changes that you make to your AddEvent calendar will be reflected in your users' calendars. Once a user subscribes to your subscription calendar, all of the events on that calendar will be added to the user’s calendar.