Parent/Child Build A Bat House.

Mass. Audubon Society Ipswich River Wildlife Sanctuary. 87 Perkins Row. Topsfield. 7:00 p.m. to 9:00 p.m. For families with children 6 years and older. Take a walk with our bat detector to search for bats hunting in the early evening sky. $18/family (includes one kit; additional kits are $12 each and must be ordered when you register). Discount for members. Registration required. 978-887-9264. www.massaudubon.org