Chapter 8 - "The Deathday Party" - In which Harry is caught dripping mud on the carpet by Filch, is taken to Filch's office, discovers that Filch is not a wizard, and Nearly Headless Nick invites him to his Deathday Party, which HRH attend on Hallowe'en night. Leaving the party, Harry hears voices again, and following the sound with Ron and Hermione discovers writing on the wall and a Petrified Mrs. Norris.
Detention with Lockhart
With Ron gone off to the trophy room with Filch, Harry reluctantly heads for Lockhart's office. There he helps Lockhart answer his fan mail, and for the first time hears a venemous voice in the walls.
As October arrives and passes, a spate of colds flows through the school, leading Madam Pomfrey to hand around [Pepperup Potion]; meanwhile, [Oliver Wood] continues to lead the [Gryffindor Quidditch team] through manic practices.
Conversations with Nick and Filch
Returning muddy from a tough [Quidditch] practice, Harry runs into Nearly Headless Nick, who shares his disappointment at being rejected by the [Headless Hunt]. Soon, though, Filch arrives, screaming at Harry for dragging mud through the [entrance hall].
Filch drags Harry off to his office, but is distracted by a large bang overhead. When he leaves, Harry discovers a Kwikspell envelope on Filch's desk - and when Filch returns he notices it's moved and kicks Harry out of his office.
The Deathday Party and What Came After