Adam Baratz has very nice post on his blog (Form and Content) about performances of Rzewski's music at NEC check it out!
Steven Drury gets extra helpings of kudos as I marvel at anyone who can play Rzewski's magnificent "The People United" (monumental variations on Chilean composer Sergio Ortega’s El Pueblo Unido Jamás Será Vencido from memory. I have heard from his students about this feat, but never from anyone who had seen/heard it done in recital.
While there check out the rest of Adam's blog! It's good reading.