The 29th Annual San Francisco Wine Auction is happening on Friday, April 29th. To my knowledge, tickets are still available.
The auction is held annually to benefit the Guardsmen General Fund to develop education programs for the Bay Area's at-risk youth. This year's event is being held at the Westin St. Francis with a 3-course dinner developed by Michael Mina.
The participating wineries offer pours (as well as, I believe, auction lots), and there are some veddy, veddy spiffy "Lifestyle Lots" as well.