From SFBC:

Take a merry ride over the bridge to the Headlands Center for the Arts and drop in on their fall Open House. Meet HCA’s Artists in Residence and Affiliate Artists in their studios, see and discuss current works-in-progress, and check out this very groovy scene nesting in the former Fort Barry site. The HCA Open House is free, but bring snack money and an appetite for aesthetic intrigue.

SF Bicycle Coalition recreational rides are free for members (a $5 donation from non-members is appreciated); rain cancels rides. Contact Andy, for more info.