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.
National Christmas Tree Association National Christmas Tree Association The National Christmas Tree Association (NCTA) is a professional organization in the United States of over 5,100 "Christmas tree professionals" in various capacities. The group focuses its work into three areas: promotion and research, federal representation (which includes Congressional lobbying), and professional education. The association was founded in 1955 and has more than 1,800 members. The official White House Christmas tree, or the Blue Room Christmas Tree, is donated each year by the National Christmas Tree Association (NCTA). The NCTA has donated the tree since 1966; it is chosen through a contest among members of the