The Super Billiard Expo - I've only been once, but it was a very nice event - everybody is there.
Q-lympics is also a very well run event and I hope that Mark Griffin decides to continue with it every year. I believe the attendance problems are due to duration and scheduling, and hopefully in the future everything will fall into place. I've heard great things about this event from many people, and for it to continue, the players and fans must support it.
When I was living in El Paso, I used to attend the WPBA US Open every year in Albuquerque, New Mexico at the Sandia Casino. They have since changed the venue. While here in Florida, I love going down to the Cuetec Classic at the Seminole Hard Rock Hotel & Casino. It's a great event, everybody has a great time and the venue is awesome. Sometimes I have a better time as a spectator than as a player - no pressure. lol