The musical group 8th Day — brothers Shmuel and Bentzi Marcus — perform a Chanukah unity concert in Suffern at Rockland Community College on December 30. Doors open at 6:30 p.m., concert is at 7. Sponsored by Hillel Rockland, the Center for Jewish Life at RCC, and Jewish Federation of Rockland County. In RCC’s Cultural Arts Center, 145 College Road. Tickets, Rabbi Dov Oliver, (845) 574-4422 or hillelrockland.org/concert.