The Hopkinton Center for the Arts presents a Merry Mixer on Sunday, Dec. 15, from 1-2 p.m. for guests ages 55 and older. This event will feature festive drinks, food and music performed by the HCA’s Jr. Treblemakers chorus, which consists of students in Grades 3-5. It precedes the Holiday Movie Magic with the Treblemakers concert that will take place from 2-3 p.m. For more information, visit hopartscenter.org/events.