Saturday, Oct. 1-Sunday, Oct. 30, Four Rivers Environmental Education Center, Channahon.

10 a.m.-4 p.m.

Supernatural Scavenger Hunt: Wear your favorite costume and search for spooktacular items in the forest with your friends and family or Scout group. Some items may be natural while others items may be SUPER-natural. Stop by the visitor center to get a map of the route and a list of the items. Free, all ages.