The next QuakeCon will be happening August 13-16th in Dallas, Texas at the Hilton Anatole Hotel. All you have to do is register and attendance is free unlike other cons. Besides getting news on all things iD, you and up to 3,000 others can bring your own computer to play. Registration will begin on March 6th at 9:30pm EST but you can register for a room now through the QuakeCon Reservation Page
or by calling 1-800-HILTONS. Rooms will cost $145 for up to quad occupancy. I've never been to a QuakeCon myself but heard they are pretty fun and you can play in a nice massive LAN while you're out there.