Holy Trinity Church of Cambridge, MA, will present “Timeless Classics: Music of Bach, Handel & Vivaldi,” on Sunday, Sep. 22, at 1 p.m. in the church sanctuary (145 Brattle St., Cambridge). Featuring the Karapetyan String Quartet. Open to the public, admission is free. For information, contact the church office at (617) 354.0632, e-mail office@htaac.org, or view a flyer.