The bog at the Charles W. Ward Reservation is the closest you can get to arctic tundra in this region. Jane Winchell, The Sarah Fraser Robbins Director of the Art and Nature Center and curator of the Polar Attractions exhibition, leads an interactive field walk to explore the rich variety of plants – including carnivorous species – that make up this unique habitat. 9:30 a.m. – 11 a.m., The Trustees of Reservation Charles W. Ward Reservation, Andover, Mass. Please reserve by July 24 – directions sent upon registration. Members of Peabody Essex Museum $8, non-members $10. For more information call 978-745-9500, ext. 3011, or visit www.pem.org .