Currently there's really no easy way to search by events/session attributes unless you know the event you need. This is fine for the event admins as they generally know the events or are better able to search for the events they need. Regular users though do not have it that easy. The admins usually have to tell them which events they would need to search for. We should revamp this and allow the user when searching by events to either enter the name as we can currently or use the tags to narrow down the events.