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
[Dumbledore] begins his first private lesson with [Harry] vaguely explaining the purpose of the lessons, explaining that they will be using the [Pensieve] to learn more about [Voldemort]'s past.
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] and [Harry] discuss the scene they just witnessed, including [Voldemort]'s relation to the [Gaunts] and the relationship that [Merope] went on to have with [Tom Riddle].
[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.
While [Harry], [Hermione], and [Ron] walk to the [Quidditch Pitch], [Pavarti] and [Lavender] talk and giggle together about Ron, making Harry curious and Hermione upset.
[Harry] holds the [Gryffindor] Quidditch tryouts, which despite run-ins with inexperienced first-years, non-[Gryffindors], and [Cormac McLaggen], results in what [Harry] thinks is a quality team.
[Ron] relives the [Quidditch] tryouts, and [Harry] realizes that [Hermione] [Confunded] [McLaggen] during the tryouts, as the trio walks down to visit [Hagrid].