Blame it on the full moon (this week, anyway).

DO
September BikeAbout
What: Pedal through the San Francisco Zoo on a docent-led tour before it opens to the public.
Why: You’re such the party animal.
When: Sun., 8:30-10 a.m.
Where: San Francisco Zoo, Sloat Blvd., at 47th Ave. (415-753-7073). 

BUY
Vintage Fashion Expo
What: Clothing, accessories, and textiles from 1850 to 1980.
Why: Something old, something new.
When: Sat., 9 a.m.-6 p.m.; Sun., 11 a.m.-5 p.m.
Where: Nob Hill Masonic Center, 1111 California St., b/t Taylor & Jones Sts.

EAT
Women of Taste
What: Food and wine from Bay Area restaurants and wineries and a silent auction to benefit Girls Inc.
Why: Girls just wanna have fun.
When: Sat., 6-10 p.m.
Where: Oakland Museum of California, 1000 Oak St., Oakland (510-357-5515, ext. 19).

HEAR
Banyan
What: Mike Watt and his indie super group rock out.
Why: Watt else are you going to do?
When: Sat. at 9 p.m.
Where: 12 Galaxies, 2565 Mission St., b/t 21st & 22nd Sts. (415-970-9777). Tickets at virtuous.com.

DO
Sex and the City Premiere Party
What: To celebrate the show airing five nights a week, KRON is giving away 1,000 pairs of fancy shoes (we can’t tell you the brand name, but it rhymes with “loo”).
Why: All aboard the choo-choo train.
When: Sun., noon-4 p.m.
Where: Union Square, Geary St., at Powell St.