World Scout Jamboree movement learn about other peoples and nations by direct interaction with them. The idea of organizing such periodical international gatherings was originally conveyed to Baden-Powell by the General Chief of the Scouts of Greece, Konstantinos ("Kokos") Melas, during the 1918 international Scout meeting, in England.Captain Melas proposed the gatherings should repeat every four years, in the same way Olympic Games were held in Ancient Greece. The suggestion was accepted with enthusiasm by Baden-Powell, who named the gatherings "Jamborees". It was in 1920 that the first World Scout Jamboree was realized, held in the Olympia halls in Kensington, London. Symbolically, the
1909 Crystal Palace Scout Rally and Boy Scouts from the British Boy Scouts, Church Scout Patrols and other Scouts not registered with what would become the Boy Scouts Association, leading to challenges regarding the 4th Scout Law that "A Scout is ... a brother to every other Scout". The Rally was a precursor to the later Scout Jamborees and World Scout Jamborees. The concept of the Scouts' Own, a simple, non-denominational religious ceremony, was also introduced by H. Geoffrey Elwes at this rally. Members of the local Scout Troop, 2nd Croydon (1st Crystal Palace Patrol), formed part of the flag party for Princess Christian, the