Holy Trinity Church of Cambridge, MA, and the Erevan Choral Society and Orchestra will present a “Christmas Holiday Concert” on Sunday, Dec. 10, at 7 p.m. in the church sanctuary (145 Brattle St., Cambridge). This year’s concert–honoring the 850th anniversary of St. Nersess Shnorhali, and supporting humanitarian efforts for families of Artsakh–will feature soloists Rubik Mailian and Astghik Martirosyan, who will join the chorale under the baton of Maestro Konstantin Petrossian. Open to the public, admission is free. For information, contact the church office at (617) 354.0632, or e-mail office@htaac.org. Click the link to view a flyer.