Hail to the Trail is Purcellville’s annual Green Expo. It is designed to connect residents and families with organizations that focus on nature and the environment. The event is free and open to the public. It gives families the opportunity to explore the 10-acre Chapman DeMary Trail, meet local environmental experts, participate in fun hands-on activities, help plant trees, make nature art projects, learn about native flora and fauna, find out about creek critters, and more.