We knew we were in for a treat when we walked into a Saturday night benefit for the Theatre Offensive in the South End. Greeted by a curtain of red feather boas, guests danced the night away Studio 54-style, also participating in an auction of items including the naming rights to the next dog in a Robert Parker novel. The evening hit its high point with a performance by Norma Jean Wright, former vocalist for the disco band Chic.