Joshua’s Tract Conservation and Historic Trust sponsors a walk of the Atlantic White Cedar Bog in North Windham from 9 to 10:30 a.m. Led by Ked Metzler, ecologist from the state Department of Environmental Protection; David L. Wagner, professor of Ecology and Evolutionary Biology at the University of Connecticut and Juan Sanchez, naturalist. Insect repellent and hat recommended. Dirt road near Home Depot on Route 6 will be market. Knee-high water-proof boots optional. Information: 429-9023.