Who celebrates it?
Nude recreation refers to recreational activities which some people engage in while nude. Historically, the ancient Olympics were nude events. There remain some societies in Africa, Oceania, and South America that continue to engage in everyday public activities—including sports—without clothes, while in most of the world nude activities take place in either private spaces or separate clothing optional areas in public spaces. Occasional events, such as nude bike rides, may occur in public areas where nudity is not otherwise allowed.
While nude recreational activities may include sports such as tennis or volleyball, nude sporting activities are usually recreational rather than competitive or organized.