Politics was not the intended focus of the day-long conference that opened “Radical Bodies: Anna Halprin, Simone Forti, and Yvonne Rainer in California and New York, 1955-1972,” an exhibit at UC Santa Barbara’s AD&A Museum. Art was. The hugely instructive exhibit unearths and traces the influence on American modern dance of three groundbreaking, bi-coastal dancer/choreographers. ...