Oct. 17 & 18 (different times & locations). An ensemble of 7 A2SO musicians led by A2SO concertmaster Aaron Berofsky performs a program of chamber music that includes Camille Saint-Saëns’s Fantaisie for Violin and Harp; Arthur Foote’s A Night Piece for Flute and String Quartet; Rebecca Clarke’s Prelude, Allegro, and Pastorale for Clarinet and Viola; and Ravel’s Introduction and Allegro for Flute, Violin, Harp and String Quartet. 7 p.m. (Sat.) & 3 p.m. (Sun.), First Unitarian Universalist Congregation of Ann Arbor, 4001 Ann Arbor–Saline Rd. (Sat.) & First Presbyterian Church of Ypsilanti, 300 N. Washington, Ypsi (Sun.)  Free, but preregistration is required at a2so.org/chamber-concerts. (734) 994–4801.