The Delaware Center for the Inland Bays and the Delaware Division of Fish & Wildlife will host Trick or Tree-t, a Halloween-themed tree planting event, from 10 a.m. to 1 p.m. Oct. 20 at the Assawoman Wildlife Area, 37604 Mulberry Landing Road, Frankford.

Plant trees and add to a forested area at Sassafras Landing, then explore why forests are important. Guests should bring a paper milk carton and learn how to turn it into an owl-shaped bird feeder. Guests are encouraged to dress in their best costume and compete in the costume contest.

For more, visit inlandbays.org.