Barbican, LondonThe 1971 debate on feminism is deconstructed in an almost pitch-perfect Wooster Group productionOn 30 April 1971, Norman Mailer squared up to feminism in a public debate at New York's Town Hall. Germaine Greer was on the panel and Susan Sontag in the audience. According to the radical lesbian Jill Johnston, one of the participants, it was a political disaster but a social triumph. Greer was riding hig…