I would definitely go to this one.

Saturday October 8, 2011
10:00 am until 6:00 pm.
Hall of Flowers in
Golden Gate Park
in the beautiful city of San Francisco.

The annual Fall Classic, the TRPS Festival of Rock Posters
Featuring rock poster artists and dealers from around the country,
this is the biggest rock poster event of its kind any­where!
The best of the best, and you’ll find every­thing from vintage
psychedelic treasures to the best of the mod­ern silkscreen move­ment.
Admission is $10 for the public, and $5 for TRPS members with card.
Yes, you can join (or renew) there and take advan­tage of the member discount.
The Hall of Flowers (Old County Fair Building) is at the
corner of Ninth and Lincoln on the South edge of the Park,
not far from the Haight, the deYoung Museum, and the Academy of Sciences.

-Reba