Back by popular demand, Native Concordian, world-renowned naturalist, lecturer, birder, and author Peter Alden will present his new memoir, My Wild Life: Rare Birds, Close Calls, and the Adventures of an Eco-Explorer. Book signing will follow. Alden will share stories and photos from his decades of travel to over 100 countries and 7 continents. Signed copies now on sale at the Thoreau Society Shop at Walden. Parking is first-come, first-served. On sunny, holidays, and weekends, Walden Pond often closes due to capacity. Please check DCR Park Alerts for closures at mass.gov/parkalerts or call 978-369-3254 to check if there is a closure alert.