On February 17, some 200 naked men and women swimmers take part in the Sydney Skinny, the first nude ocean swim which starts at Sydney's Middle Head and covers a distance of 900 metres.
- Update: Close to a thousand swimmers took part in the Sydney Skinny on February 17.
On March 3, Melbourne's Naked Bike Race is scheduled to take place.
These are two Australian events in which men and women are able to participate sans clothing.
Otherwise, don't go nude except at designated nude beaches.

Lots of other social nudist events here.
Such as? Haven’t heard of any…
sounds cool