Play it by hear. GO Treasure Island Music Festival What: Two-day music fest features electronica, hip-hop, garage rock, and indie pop with headliners like Goldfrapp and Chester French. Why: Treasure every minute. When: Sat. & Sun. See performance schedule. Where: Treasure Island. See transportation and parking guide. Tickets online at treasureislandfestival.com. SHOP Lulu Frost What: Lisa Salzer’s haute jewelry collection debuts in SF with pieces created from reworked vintage bits. Why: Chill out. When: Mon.-Thurs., noon-7 p.m.; Fri. & Sat., noon-8 p.m.; Sun., noon-6 p.m. Where: BellJar, 3187 16th St., at Guerrero St. (415-626-1749). Andronico’s What: Bay Area gourmet grocer reopens its Inner Sunset digs after an extensive renovation. Why: Food for thought. When: Daily, 7 a.m.-11 p.m. Where: 1200 Irving St., at Funston Ave. (415-661-3220). GRUB Presidio Social Club Brunch What: The Presidio resto launches everyone’s favorite meal with mimosas and rum-soaked challah French toast on the outdoor patio. Why: Pay your dues. When: Sat. & Sun., 10 a.m.-2 p.m. Where: 563 Ruger St., The Presidio (415-885-1888). LAUGH Lewis Black Live What: Kooky stand-up comedian brings expletive-infused humor to UC Berkeley. Why: Back in Black. When: Sat., 8 p.m. Where: Zellerbach Hall, Bancroft Way, at Telegraph Ave. (510-642-9988). Tickets online at ticketmaster.com.