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Sundays and accordions might make you think of polkas and plump ladies eager to pull you onto the dance floor. But not at Wolf Trap’s 12th Annual Louisiana Swamp Romp, where every band but one boasts an accordion playerbut most play at the crossroads of roots, blues, funk, rock, and, of course, zydeco. The four headliners include the Wild Magnolias, who mix traditional Native American chanting (complete with ornate costumes) with funk and a jazzy Afro-Latin sensibility; the Bluerunners, a stripped-down roots band; Lil’ Band O’ Gold, an aptly titled Cajun rock group made up of some of South Louisiana’s most notorious musicians; and Boozoo’s Magic Sounds, who play the purest zydeco of the lot and will host a bit of a memorial concert following the death earlier this month of zydeco grandfather (and father of many band members) Boozoo Chavis. Missed Mardi Gras? Have an unquenchable thirst for bright plastic beads? This is the place for you. The festival begins at 2 p.m. at Wolf Trap’s Filene Center, 1551 Trap Road, Vienna. $22. (703) 218-6500. (Hannah Lord)