Chamber Music Series Concert: Sunday, Jan. 21 at 2 p.m. Coordinated by flutist Gunnery Sgt. Elisabeth Plunk, this concert will feature several different ensembles formed by members of “The President’s Own,” including two different trios: clarinet, piano, and vocal, and flute, viola, and harp; a brass quintet; a marimba quartet; and a string quartet. The concert is free and no tickets are required, and will take place at John Philip Sousa Band Hall at the Marine Barracks Annex in southeast Washington, DC.