Source to Sea Clean-up—Get involved in the 19th year of the Source to Sea Cleanup. Individuals or groups work as teams from 9 a.m. – 12 p.m. to make the watershed a cleaner place on sites that run the gamut from fishing trash to illegal dumping. School groups can schedule cleanups in the week preceding the 26th. For ages 7 and older. Meet in the Great Hall. Pre-register: 800-859-2960. Free.
Friends of The Great Falls Discovery Center