Bay seniors who recall that breakthrough moment at high school dances when suddenly you did not need to have a partner, might find themselves curious about the Ecstatic Dance evenings being held regularly around here. Other than a loose association with Namaste Yoga, it appears to be pure self-expression. Shoes, perfumes and talking are discouraged but pretty much everything else goes, including a partner or two if you like. Happening now in SF, Oakland, Berkeley, Palo Alto and (of course) Fairfax. $15 a session.