Baltimore’s Dan Deacon is both serious electronic-music composer and goofy subverter of concert conventions, all contained in an übernerdy, roly-poly persona. Typically playing on the floor surrounded by his fans and conducting loony summer-camp games for them, Deacon also creates exciting tracks that alternately tickle synth-pop funny bones and swell into serious hypno-drone jams in the vein of sonic cosmonauts like Boredoms and minimalist masters like Philip Glass. Deacon’s shows are like some giddy, chaotic, alternate-world Olympics. (Neptune Theatre, 1303 NE 45th St,, 8 pm, $13 adv/$16 DOS, all ages)