Your query is ok.
- Just add
LIMIT 20
for example if your query takes a took long time, - Add the
user_events
andfriends_events
permissions.
Doc: https://developers.facebook.com/docs/reference/fql/event_member
Update:
Permissions should be set in the cloud & then requested on login from your client. Here is the login:
FB.login(callback, {scope: 'user_events,friends_events'});