The White Elephant stall at an English village fête is a jumble stall. People bring surplus and unwanted household goods – or "white elephants" – and they are sold for charity.
The term stems from Thailand and Burma where the white elephant was seen as a sacred animal and was not used for labour, thus could not pay for the cost of its maintenance. Hence a "White Elephant" is something that costs more to maintain than it is worth.
The term is also used for a party game in the USA, the White Elephant Gift Exchange, where players compete against each other for a selection of gifts.