Question: And which Event Details have more than one participant? | Do you mean the Event Details of the event? | I mean the details of the events that have more than one participant.
SQL: SELECT T1.event_details FROM EVENTS AS T1 JOIN Participants_in_Events AS T2 ON T1.Event_ID   =   T2.Event_ID GROUP BY T1.Event_ID HAVING count ( * )   >  1