danceathon

plural danceathons

1. A charity event in which participants engage in a prolonged session of dancing.

   The first-time event, modeled after a Seattle danceathon, raised an estimated $10,000...

   1989 June, Cincinnati Magazine, volume 22, number 9, page 12

   1 more example

   Out of desperation promoters hit upon the idea of marathon events - walkathons, danceathons, and almost inevitably skateathons.

   2009, Adam Russ, 101 Sports Not to Try, page 140