This weekend, May 23 & 24 2009 is Hal Lutsky's spring postcard show in San Francisco.
It's not the largest venue, but it does get a lot of traffic. Due to the location in Golden Gate Park a lot of passersby stop in.
My friend Arlen has a few tables at the show - selling 25 cent cards. Don't be fooled though, there can be some gems found for those willing to look through his 100+ boxes of cards - especially those looking for foreign cards. Here's a picture from the January show:
With free admission, and 1 Million Postcards from 50 or so dealers to browse, the SF show is a great way to spend an afternoon.