It’s officially patio season and El Rio’s been greeting the heat every Labor Day for 13 years with its annual Cowgirl Palooza. Dig your boots out from under the bed and stomp up a storm to live performances from The Muddy Roses, The Patsychords, Maurice Tani & 77 El Deora and The Mother Truckers, appearing for the first time in San Francisco in ten years. They’ll be serving up free barbecue for a spell, so be sure to get there early.