A Yule Night's Dream

The Yule ball is coming at Hogwarts. Harry Potter wants to go with Cho Chang, but Cho and Cedric Diggory are already going together. Ginny Weasley is pining after Harry who ignores her. Professor Flitwick has learned that Madam Pince has acquired a rare book which he wants to read. And Dumbledore has tasked Snape to get a group of Slytherins to perform a play at the ball...