You can check the events you already attended and those you have been invited to from either the Group page or the Home page.
Checking Group Events
To check the events for a particular group, go to the Group page, Events tab. Here you will see all events – past and future – listed by default. Select Upcoming to see only future events, with featured events or the ones happening soonest showing up first. Past will show events you have already attended.
Checking All Events
To check the events for all groups that you are a member of, from the Home page, select Events. Here you will see all the events you have been invited to. You can see your RSVP status indicated on each event.
Syncing Events to Your Calendar
From either the Group page or the Home page, you can check your past and future Events in the Calendar.
At the bottom of the Calendar, you have the option to synchronize events with your personal calendar. For more details on this, see the article Your Calendar.