Hermione returns to the [common room] from the [library], and excitedly tells Harry and Ron about her new organization, [S.P.E.W.] She ignores their hesitations but Harry and Ron are spared answering for the moment by Hedwig, who brings a reply from Sirius. Harry's anxiety only increases, though, when he reads that Sirius is returning north.
Harry walks up to his [dormitory] and lays in bed, thinking about how he believes he's put Sirius in danger by spurring him to return to Britain. Meanwhile, he doesn't realize it, but Neville is lying awake as well.
Chapter 15 - "Beauxbatons and Durmstrang" - In which Harry sends an owl to Sirius telling him everything is fine. In DADA, Moody puts the Imperius Curse on everyone and only Harry can resist it, school work piles up, Hogwarts spruces up for the visitors, Hermione continues her elf rights campaign, a message via Hedwig announces that Sirius is back in the country, and the Beauxbatons and Durmstrang students arrive by flying carriage and submerged ship respectively.
Harry wakes up early to pen a letter to Sirius, trying to convince him not to come back to Britain. Hermione is upset with him for lying about his [scar] not hurting, but soon drops it, and Harry's anxiety level stays high for a couple of weeks.
Harry Throws Off the Imperius Curse
McGonagall explains to her fourth years that her homework load has increased given that they are nearing their [O.W.L.] year, though this explanation elicits some groans from the class.
Many of the fourth years' classes pile on homework, including Trelawney (who assigns another month of predictions), Binns, Snape, and Flitwick. Hagrid's homework of coming down to observe the Blast-Ended Skrewts gets a snide remark from Malfoy, but Hagrid quickly puts it to rest by reminding Malfoy of being turned into a ferret.
Preparing Hogwarts for the Arrival of Guests
A sign in the [entrance hall] advertises the upcoming arrival of students from [Beauxbatons] and [Drumstrang]. This gets students talking about the tournament, including some commenting that Cedric Diggory is planning to enter.