There’s a dark hypothesis in Harry Potter and the Goblet of Fire regarding what the Yule Ball signifies for Triwizard champions Harry, Fleur Delacour, and co.
The Triwizard Tournament is the main emphasis of Harry Potter and the Goblet of Fire, but the Yule Ball plays an important role in the plot, and there’s a dark notion about why it exists.
The fourth novel in J.K. Rowling’s Harry Potter series takes place during Harry’s fourth year at Hogwarts, which is staging the Triwizard Tournament, a three-event tournament of magical prowess. From the Goblet of Fire, three candidates were chosen: Cedric Diggory of Hogwarts, Fleur Delacour of Beauxbatons, and Viktor Krum of Durmstrang.
However, the cup unexpectedly pulled Harry’s name as well, and the Boy Who Lived was unknowingly propelled back into the spotlight.
Harry Potter and the Goblet of Fire was a watershed moment in the series. The fourth Harry Potter novel was not only significantly longer, but it also saw Harry, Ron, and Hermione mature into young adults.
This was on full show during the Yule Ball and the race to find the right date. Ron was smitten by Fleur Delacour and invited her to the ball, but she rejected it.
Cho Chang turned down Harry as well. However, love rejection was not the worst part of the Yule Ball in Harry Potter, since the celebration may have had more malevolent aims.
The Yule Ball Revealed the Relationships of the Triwizard Champions

Though the Yule Ball was marketed as an opportunity for Hogwarts students to “socialize with their foreign guests,” a dark hypothesis posits that the true objective was for Triwizard Tournament organizers to gather information on who was essential to the champions and utilize it in the second assignment.
The champions had to release their loved ones who were being held captive underwater in the second assignment, which took place in the Great Lake. Harry had Ron, Fleur Delacour’s sister Gabrielle had her, Cho had Cedric Diggory, and Hermione had Viktor Krum.
The hostage selections are revealing, as they are directly related to the Yule Ball. Cho and Hermione had a great time dancing with Cedric and Viktor, to Harry and Ron’s dismay, and they weren’t the only ones who noticed.
As a result, the Triwizard challenge organizers picked the girls to represent their champions’ loved ones since they were the most compatible Yule Ball couples.
On the other hand, Harry turned down his date, Parvati Patil, in favor of sulking with Ron, therefore it stands to reason that she would not be a prisoner, but Ron would. The choice to make Fleur Delacour’s sister a captive, on the other hand, seems puzzling.
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Fleur Delacour Disliked Her Yuletide Ball Date

Fleur Delacour was a quarter-Veela witch, and her beauty drew the attention of many male students during her visit to Hogwarts, yet she chose Ravenclaw Quidditch captain Roger Davies as her Yule Ball date.
While they didn’t have the same chemistry as Cho and Cedric or Hermione and Viktor, they had a better time than Harry and Parvati and even stole away for a romantic entanglement in the rosebushes.
It’s likely that the Triwizard organizers were unaware of Fleur and Roger’s departure from the Yule Ball, or that if they were, they were savvy enough to realize that their relationship was merely physical and that Roger wasn’t high enough stakes for Fleur in the second job.
It’s worth noting that Fleur was instantly taken by Bill Weasley, her future husband, when she spotted him at the third assignment, whereas Roger just looked to be her best available alternative for the Yule Ball. The Yule Ball notion may or may not be real, but it certainly suits the darker tone of Harry Potter’s fourth book.