FILM: Ali MacGraw will be in person at Marc Huestis' Valentine's Day Celebration, featuring a screening of Love Story and a gala hosted by Katya Smirnoff Skyy, which includes tribute performances, an Ali MacGraw/Ryan O'Neal "Preppie vs Radcliffe Bitch" look a-like contest, a career valentine/clip compilation of Ali's work, and an onstage interview with Ali. (8 to 11 p.m., Castro Theatre, 429 Castro Street)

SINGALONG: For those who aren't too fond of Valentine's Day, SF IndieFest has you covered with Love Bites: 80s Power Ballad Sing A Long, featuring the music of Guns 'n Roses, REO Speedwagon, Bon Jovi, Journey, Warrant, and more... "We'll hold lighters in the air and sway, we'll pound our fists at the sky in defiance of those who would dare not love us, and we'll do it all with teased hair and animal print tights on." (9:30 p.m., Roxie Theater, 3117 16th Street)

FOOD: Looking for a last-minute, super sweet date idea? Head to the zoo for their annual Woo at the Zoo, featuring sexpert Jane Tollini's Yin Yang Yippee! a new cosmic look at the sex lives of animals, along with a dinner buffet and drinks and a live animal encounter. Rawr! (6 to 9 p.m., San Francisco Zoo, 1 Zoo Road)