“Old-Time Maple Sugar Festival”: Waterloo Natural History Association.
Activities include a guided walk to see various methods of collecting sap, demos of boiling sap down to make syrup, and a display of antique syrup-making equipment. Maple products available for purchase. 10 a.m.–4 p.m., Eddy Discovery Center, 17030 Bush Rd., Chelsea. Free. $12 ($17 at the gate) recreation passport required. 475–3170.