In her 1965 “No Manifesto,” postmodern dance pioneer Yvonne Rainer rejected dance’s dominant paradigm: technical style and stage spectacle, virtuosity and fantasy, heroes and seduction. Her rejoinder was Trio A, a radical and rigorous un-choreography of pedestrian movement. Rejected by audiences and critics alike at its 1966 debut, it nonetheless helped launch dance’s new minimalist direction and become a paradigm in its own right, earning no less an imprimatur than a performance at New York’s MOMA. Experience Trio A, and the origins of postmodern dance, for yourself at this Saturday’s workshop at Mills College Haas Gymnasium (5000 MacArthur Blvd., Oakland), led by Rainer répétiteur Linda K. Johnson. A culminating event in the campus residency of AXIS, Oakland’s physically integrated dance company, the workshop explores questions of who is allowed to dance and is open to all shapes, sizes, technical (in)abilities, and perspectives on (anti)heroism — in a word, anyone willing to say yes.