For the past few years, the Montreal Swing Riot provided classes and performances during the Montreal Jazz Festival. They also had a series of competitions including an event that “pits a battle of styles”. Here is one example from 2015.
How did I find out about this group? An article about the Riot’s competition of styles.
It looks like they’re having so much fun, even though they are trying to out-do each other!
(I only use past tense because their website has no information about this year.)