Clare Barron’s bloody Dance Nation is a frenetic, chaotic look at a troupe of Ohio tweens figuring out their dreams and their bodies. Barron crams a lot into her one-act Pulitzer finalist, and director Angela Brazil keeps the energetic ensemble running and dancing all over the place. A demanding and somewhat sinister teacher (Joe Wilson Jr.) sets the girls (and one boy) up for misery, announcing that they will perform a dance about Gandhi. It’s a little bit Suspiria, a little bit Marnie — one girl plays with horses while another masturbates and a third gets her period — but only one dancer will get the last word. Equally funny and stressful, Dance Nation is running in rep this month with Barron’s You Got Older.