Dec. 10, 8 p.m. to 10 p.m. Soldiers Delight Natural Environmental Area in Patapsco Valley State Park, 5100 Deer Park Road, Owings Mills. Participants will follow a naturalist on a one-mile hike and listen for and try to call out owls. There will be a discussion of biology, habitat, diet and conservation. For families and individual adult patrons. Meet at visitor center. Ages 16 and up unless joined by an adult. Call 410-461-5005 to sign up. Cost: $5 per person.