This weekend it’s only fair to treat yourself.

DO
Bay Area Pet Fair & Adoptathon
What: Bring your pooch for fun festivities or come on over to adopt a puppy dog, pussycat, or bunny rabbit.
Why: Who’s the fairest of them all?
When: Sat., 10 a.m.-6 p.m.; Sun., 10 a.m.-5 p.m.
Where: Marin Center Exhibit Hall and Fairgrounds, 10 Ave. of the Flags, at Memorial Dr., San Rafael (415-229-3174).

Ghirardelli Square Chocolate Festival
What: Two days and 30 booths of cocoa mania, including a hands-free sundae eating contest and chocolate martinis, all benefiting Project Open Hand, an organization providing meals to homebound people with HIV and AIDS.
Why: How sweet it is.
When: Sat. & Sun., noon-5 p.m.
Where: Ghirardelli Square, 900 N. Point St., at Beach & Larkin Sts.

SEE
Bad Movie Night
What: All-you-can-eat popcorn and running commentary on William Shatner at his all-time worst in Impulse for five measly bucks.
Why: It’s bad to the bone.
When: Every Sun. at 8 p.m.
Where: The Dark Room, 2263 Mission St., b/t 18th & 19th Sts. (415-401-7987).

HEAR
Samantha Stollenwerck
What: Cali-soul sister rocks out at the Dave Matthews show and with Mike Doughty.
Why: She’s Stollen our hearts.
When: Fri. & Sat., 6 p.m.; Sun. 8 p.m.
Where: Side stages at the Shoreline Amphitheatre, 1 Amphitheatre Pkwy., Mountain View (650-967-3000). Tickets online at livenation.com. The Independent, 628 Divisadero St., b/t Grove & Hayes Sts. (415-771-1421). Tickets online at ticketweb.com.

EAT
The Spanish Fly
What: Wash down authentic tapas (cabrales toasts, marinated anchovies, and patatas bravas) with a glass (or three) of Rioja.
Why: You so fly.
When: Tues.-Sat., 5 p.m.-midnight.
Where: 3300 Geary Blvd., at Parker Ave. (415-668-6934).