Performa 07 is New York’s 20-day biennial of performance art. It’s “a celebration of transience, a paean to you-had-to-be-there, a deep and exhilarating bow to we-have-only-now. Conditions for burning are right: a market clogged with knickknacks and cash. How appropriate, then, that so many pieces pay particular attention to the intersection between performance art and dance.”