The Eastern Diocese will present a special in-person concert, “Khosdoum” (“Promise”) featuring actor, scriptwriter, parodist, and singer Vardan Petrosyan, on Saturday, Dec. 3, at 7 p.m., at the Diocesan Center in New York (630 Second Ave., at 35th St., NYC). A light reception with Mr. Petrosyan, open to all guests, will follow the performance. Tickets are now on sale: Click the following links to view a flyer with details, and to order tickets securely online.