Are you a fan of Harry Potter? Get the Harry Potter Yule Ball POP! Vinyl Figure. The Yule Ball was a formal dance held on the evening of Yule (the pagan Winter solstice/Christmas celebration) of a tournament year. Opened by tournament champs and their partners, the Yule Ball was held for students of Wizarding schools who participated in the Triwizard Tournament. The formal dance was a big deal, just like prom would be for today?s teens in real life.?