When you throw a jamboree, there's usually music, cheering, or other kinds of noise involved. You can call any large celebration a jamboree, as long as it's full of celebration and raucous enthusiasm. Jamboree is an American English invention from the 1860's. The word's origin isn't certain, although experts suspect a connection to shivaree, or charivari, a French folk tradition of greeting a newly married couple by making a whole lot of noise, in a mock serenade.