In the United Kingdom Christmas decorations are put up in shops and town centres from early November. Many towns and cities have a public event involving a local or regional celebrity to mark the switching on of Christmas lights. Decorations in people's homes are commonly put up from early December, traditionally including a Christmas tree, cards, and lights both inside and outside the home. Every year, Norway donates a giant Christmas tree for the British to raise in Trafalgar Square as a thank you for helping during the Second World War. Christmas carolers at Trafalgar Square in London sing around the tree on various evenings up until Christmas Eve and Christmas decorations are traditionally left up until the evening of January 5 (the night before Epiphany); it is considered bad luck to have Christmas decorations up after this date. In practice, many Christmas traditions, such as the playing of Christmas music, largely stop after Christmas Day.