Events are displayed on timelines.
Events have Creators, Participants, Attendees, and Fans.
Creator is the person who created the events.
Participants are the people who the event is for. For example, the participants in a marriage event would be the two people getting married.
Attendees are non-participants who were present at the event.
Fans are people who were not at the event, but would like the event to appear on their Timeline.
For some helpful hints on creating events see the Capturing Memorable Events article.