The Environmental Education Alliance will kick off its 20th anniversary celebration with a winter campfire and night hike from 6 to 9 p.m. Saturday at the Chattahoochee River Environmental Education Center on Barnwell Road in Johns Creek.

The free event will feature a marshmallow roast, hot apple cider and chocolate, guided hikes and a naturalist journal with wildlife lists and paw prints. Attendees are encouraged to bring a pot luck dessert to share.

Information, registration: 678-538-1200.