“Too Much Memory” retells Antigone, but it is, as introduced, a metanarrative: a retelling of a translation. And so on the show’s final night, with the troubles of the previous night avenged, with the Bush administration deposed, with combat troops withdrawn, the play feels superfluous. The actors sit watching action as much as the audience they face; the chorus inserts herself among the audience and actors as necessary. The actual plot no longer seems necessary to the mirrored reactions.