On Saturday, March 2, from 10 a.m. to noon, Libby Hill will lead a discussion on discoveries from the revision of her book, The Chicago River: a Natural and Unnatural History, at the Arrington Lakefront Lagoon Shelter, 1631 Sheridan Rd.

The event is part of the Watershed Learning on the Great Lakes series. Each workshop includes a short talk, discussion/ hands-on activity and tea. No registration is necessary; just drop by. Come prepared to walk outside. Accessible. For more information, email Clare at clare@lakedance.org.