The strains of Adele’s “Rolling in the Deep” are pulsing, and the dance floor is packed. “There’s a fire starting in my heart reaching a fever pitch and it’s bringing me out the dark” Allemande left, Do-Sa-Do, Allemande left, weave the ring “See how I leave with every piece of you, don’t underestimate the things I will do” Swing and promenade … Yes, as the dark bluesy song pumped out of the speakers, the dancers — in a flurry that snapped into patterns — were square dancing.