In Scouting, a jamboree is a large gathering of Scouts and/or Girl Guides who rally at a national or international level. History. The 1st World Scout Jamboree was held in 1920, and was hosted by the United Kingdom. Since then, there have been twenty-four other World Scout Jamborees, hosted in various countries, generally every four years. The 26th World Jamboree is to be held in Poland in 2027. https://en.wikipedia.org/wiki/Jamboree