ART: Watch a sweet hot rod race and peruse and bid on hot rod related artwork at the 4th Annual Pinewood Derby & Silent Art Auction, put on by the Hell's Belles Car Club. All proceeds benefit the Bay Area Women's & Children's Center. The race starts at 8 p.m sharp.

6 p.m. // The Shooting Gallery (839 Larkin St) // free

FILM: SF Film Society's Film in the Fog presents an outdoor Grease Sing-Along on the spacious lawn of the Presidio Main Post Theatre, which has ample room for low lawn chairs and blankets. Get there early to secure a picnic spot. There will be pre-show entertainment before the screening starts at 7:00. The short film Sing Along San Francisco directed by George Corzine and an antic-filled classic cartoon will precede the main feature.

5 p.m. // Presidio Main Post Theatre Lawn (99 Moraga Ave) // free