Trafalgar Square Authority in conjunction with the charity Unicef, who began ticketing the event to control crowd numbers. A Christmas ceremony has been held in the square every year since 1947. A Norway spruce (or sometimes a fir) is presented by Norway's capital city, Oslo as London's Christmas tree, a token of gratitude for Britain's support during World War II. (Besides war-time support, Norway's Prince Olav and the country's government lived in exile in London throughout the war.) The Christmas tree is decorated with lights that are switched on at a seasonal ceremony. It is usually held twelve days before Christmas Day.
Trafalgar Square Horse Guard's Parade, along Whitehall to Nelson's Column. As an archetypal London location, Trafalgar Square featured in film and television productions during the Swinging London era of the late 1960s, including "The Avengers", "Casino Royale", "Doctor Who", and "The Ipcress File". It was used for filming several sketches and a cartoon backdrop in the BBC comedy series "Monty Python's Flying Circus". In May 2007, the square was grassed over with 2,000 square metres of turf for two days in a campaign by London authorities to promote "green spaces" in the city. In July 2011, due to building works in Leicester