Chapter 11 - "Hermione's Helping Hand" - In which Harry discovers his newfound popularity, learns that Stan Shunpike has been arrested, and holds a frustratingly massive Quidditch tryout that includes a run-in with Cormac McLaggen and Katie, Ginny, and Ron making the team. They visit Hagrid and learn that Aragog is dying, Harry confronts Hermione about having confunded McLaggen during the tryout, and Slughorn invites Harry and Hermione to supper, but Harry is spared having to go when Snape refuses to let him out of detention.
Harry's First Lesson With Dumbledore
With Harry and [Dumbledore] watching in the Pensieve, [Bob Ogden] visits the Gaunt house regarding a breach of law and is met with resistance from Marvolo and Morfin Gaunt. He also watches them mistreat Marvolo's only daughter, Merope, after they catch her watching the Muggle Tom Riddle drive by.
[Dumbledore] dismisses Harry from his office, after chatting a bit about the [prophecy], the [ring] Dumbledore had been wearing, and Harry's friends.
As the first weeks of the school year pass, the sixth-years are flooded with homework and expected to use [nonverbal spells] in several of their classes, and Hagrid stops showing up at meals.
The morning of [Quidditch] tryouts, Harry, Ron, and Hermione eat breakfast together. There they decide to visit Hagrid, Hermione explains Harry's popularity surge, Harry receives his new copy of [Advanced Potion-Making] and swaps its cover with the Half-Blood Prince's book, and they learn [Stan Shunpike] has been arrested.