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The spirit of Britain’s shamblers—punks who weren’t pissed off, basically—has possessed Lancaster, Pa.’s Fat Little Demons. On the quartet’s It’s Gonna Blow EP, the guitars and harmonies never actually threaten to explode, but when the band steps on the accelerator they do surge in the general direction of the Feelies’ crazy rhythms. With Eight Days at 8 p.m. at Galaxy Hut, 2711 Wilson Blvd., Arlington. FREE. (703) 525-8646. (Mark Jenkins)