The Discovery Museum (177 Main Street, Acton) will host Nature Explorers, a four-part series of outdoor explorations for children 6-9 years old with their caregivers. It will be held 10AM-11:30AM on September 11, 18, 25, and October 2 in the Great Hill conservation land. Children and their caregivers should plan to attend all four sessions. This is not a drop-off program. Cost is $40 per child. Register here.