jamboree

n. [ Etym. uncertain. Cf. Jambone. ] 1. A noisy or unrestrained carousal or frolic; a spree. [ Slang ] Kipling.

A Calcutta-made pony cart had been standing in front of the manager's bungalow when Raja Singh started on his jamboree. W. A. Fraser. [ Webster 1913 Suppl. ]

2. a large festive gathering. [ PJC ]

3. an assembly of boy scouts, usually at the national or international level, including camping among the activities; -- a term adopted by the Boy Scouts organization. [ PJC ]