On Election Day, House of Scordatura presents a six-hour, uninterrupted performance of Morton Feldman’s String Quartet No. 2. Feldman wrote it in 1983. It is quiet, slow and long, and it asks nothing of the listener except attention. There is no intermission, and you can come and go as you like, whether you stay for ten minutes or all six hours. The date is deliberate: a quiet room on a noisy day. All proceeds benefit the Portland Immigrant Rights Coalition.