The Chattanooga Grotto caving community will host a special glimpse, through photos, of the wild caves that make the Southeast one of the premiere caving destinations in the world. Get special insight into the fragile ecosystems and endangered species that drive cave conservation in the Southeast.The presentation is free and open to the public.BYO-Camp Chair and non-alcholic beverage. Outdoor Chattanooga, 200 River St. in Coolidge Park. Cost: Free. outdoorchattanooga.com.