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.

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Inventor Lonnie Johnson stands with his Super Soaker water guns at JTEC Energy on Wednesday, Oct. 29, 2025, in Atlanta. Johnson, a former NASA engineer, is currently working on a new energy technology through his company’s JTEC device that turns thermal heat into usable energy. (Natrice Miller/AJC)