On June 21 from 6:30 to 8:30 p.m. at Stateline Woods Preserve (814 Merrybell Lane, Kennett Square), The Land Conservancy will mark the changing of seasons and the longest day of the year. Participants can explore woodlands in search of creatures of the night such as owls and bats. Visit www.tlcforscc.org to register. The fee is $5 for TLC members, or $10 for non-members.