Saturday Explorations: Friends of the Field. Mass. Audubon Society Ipswich River Wildlife Sanctuary. 87 Perkins Row. Topsfield. 1:00 p.m. to 2:30 p.m. For families with children 5 years and older. Explore the fields with sweep nets to discover the many varieties of insects that live there such as crickets, grasshoppers, praying mantids, dragonflies, and more. Make solar pizza ovens, learn how solar panels produce electricity, and explore different ways we can use the sun’s energy. $9 adults, $7 children (discount for members). 978-887-9264. www.massaudubon.org