If not, you risk missing the spectacle of a grand actress falling apart at the seams, before your very eyes. We mean the character that Lavin plays, an imperious thespian named Audrey Langham, who, flamboyantly costumed to play "Medea," decides at the inopportune moment of final tech rehearsal to go nuts — rambling unhappily onstage about everything from her lines to her director to that assistant who brought her the wrong kind of tea to her costume: "What the hell am I wearing!?