The Thames River Basin Partnership sponsors its annual floating workshop from 12:30 to 5:30 p.m. starting at the Mansfield Community Center, 10 South Eagleville Road, Storrs. Keynote speaker: Mark P. Smith, director of the Eastern U.S. Freshwater Program for the Nature Conservancy. Includes boat tour of the Mansfield Hollow Lake to learn about resource tools. Price: $25. Reservations or information: 928-4948 or www.trbp.org.