December 15-19, 2008 
San Francisco, California

As stated on the Pinnacle website:

Mark your calendars today to attend the 2008 AGU Fall Meeting! The Fall Meeting is expected to draw a crowd of over 15,000 geophysicists from around the world. The Fall Meeting provides an opportunity for researchers, teachers, students, and consultants to present and review the latest issues affecting the Earth, the planets, and their environments in space. This meeting will cover topics in all areas of Earth and space sciences.

More Info:
AGU Fall Meeting