Linux World Conference and ExpoWhen: August 14th - 17th
Where: San Francisco, U.S.A.
More Info: http://www.linuxworldexpo.com/live/12/events/12SFO06A
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.