On Jan. 21, rain or shine, 10 a.m. to 1 p.m. (Register at 9:30 a.m.), meet with other Anacostia Riverkeeper volunteers at Pope Branch Park to help clean up the riverbank. Meet at corner of Fairlawn Ave. and M Pl. SE. All supplies are provided. Wear closed-toe shoes and work clothing. For questions, email email@example.com. Sign up at bit.ly/2zTMF4Z.