Just for Laughs (French: Juste pour rire, and stylized as Just for laughs) is a comedy festival held each July in Montreal, Quebec, Canada. Founded in 1983, it is the largest international comedy festival in the world. History. Saint-Denis Theatre, the theatre where the show used to film at until 2010. Inside Saint-Denis Theatre, 2005 Just for Laughs festival. Improv All Stars stage, Just For.