I've attended the Mt. Airy Fiddler's Convention (in Mt. Airy NC) most years starting in 1983. Although there is a stage where one can compete for prizes (best band, best fiddler, best banjo player, etc.) the real reason I attend is to visit with friends and play music. There are hundreds of jam sessions going on all over the park.
On Saturday night after the music competitions are over, there is a dance (clogging) competition. Most people who enter really can dance. One year I entered the dance competition wearing a Barney the Dinosaur costume. A friend happened to record the event on video.