jamsession Jazz club get-together Informal gig Improvisational gig Impromptu musical performance Impromptu jazz exhibition Impromptu concert Free musical event Cats' get-together After-school pig-out? There are no plans for this Informal gathering of musicians Impromptu jazz performance Join masses dancing for music performance Play time? Musical get-together Professional development for a Smucker's employee? Musicians' improvisational get-together