Come down to Seattle’s forgotten south end river to help clear trash, make new friends, and discover a waterway soon to be cleaned up as an EPA Superfund site. (Don’t worry, you won’t be handling that stuff.) Partners include the Duwamish River Cleanup Coalition, CleanScapes, and People for Puget Sound. Sign up and pick your site at duwamishalive.org. Bags, tools, and instructions will be provided, along with snacks and coffee! Try to snag a place on one of the boats loaned to the the effort, so you can see the river up close. T. BOND

Sat., Oct. 9, 10 a.m.-2 p.m., 2010