Once you click on Google Calendar or iCalendar, you’ll be redirected to your calendar application of choice and can add the calendar with one simple click. All new events and event updates will automatically appear on your personal calendar. Subscribing to events will always create a new calendar in your app.
On the single event page, the Google Calendar link will add the event directly to your Google Calendar. The iCal Export link downloads an .ics file for you to import to iCalendar or another calendar source.