Linux World Conference and Expo (LWCESF) will have more than 100 sessions on GNU/Linux, with a few sessions by Free Software and Free Culture notables like Lawrence Lessig and Eben Moglen. There are also be a large number of other exhibitors and conference tracks at LWCESF as well.
Debian will be operating a booth in the .org Pavilion again this year at LWCESF so you can ask questions and meet Debian people in person.
Main Coordinator: Don Armstrong, Hans Uhlig