The Yule Ball has been a tradition at Hogwarts for years. They only do the Yule Ball at Hogwarts when they are doing the Triwizard Tournament there. It's a time to have fun, dress up, dance, drink, and eat. Ron goes to the Ball with Pamba, Harry goes to the Ball with Parvati, Cho goes to the Ball with Cedric, Hermione goes to the ball with Viktor, and Ginny goes to the Ball Neville.