What are the possible reasons for Harry not to celebrate Halloween in the fanfic?

It could be that in this particular fanfic's universe, Harry follows a different cultural or religious belief that prohibits him from celebrating Halloween. This new set of beliefs might have been introduced in the fanfic's unique storyline.

Maybe in the fanfic, there could be a misunderstanding between them. For example, Ron might have accidentally broken Harry's trust in some way, like revealing a secret of Harry's that he wasn't supposed to.

One reason could be revenge. Bellatrix might want to get back at Harry for causing problems for Voldemort and the Death Eaters. Kissing him could be a form of humiliation. Another reason could be a power play. By kissing Harry, she shows that she can get close to him and has some sort of control over the situation.

Perhaps he has a newfound motivation. Maybe he met a new mentor who inspired him to take his studies more seriously. Or he could have witnessed something that made him realize the importance of knowledge, like seeing someone get defeated because of their lack of understanding of magic.

Maybe Dumbledore discovers some dark secret about Harry's past that he can't handle. It could also be that Dumbledore is trying to protect Harry in a really strange way, by pushing him away from the dangerous wizarding world around Hogwarts.

Maybe in that fanfic, there are misunderstandings between Harry and the Weasleys. For example, they might have had an argument over something like magic use or family values that led Harry to dislike them.

One possible reason is that the fanfic writer wants to create conflict. By making Hermione not believe Harry, it adds tension to the story.

The fanfic might be set in an alternate universe where Ron has a different personality. If this new personality clashes with Harry's values or his own personality, then Harry may not like Ron. For example, if Ron is made to be more self - centered in this fanfic, Harry might find it hard to get along with him.

One reason could be the strict control by the official copyright holders. They might be worried about fanfic diluting the official brand or misinterpreting the original story. Another factor could be some fans' purist view. They only want to stick to the original works by J.K. Rowling and consider fanfic as something not in line with the 'true' Harry Potter universe.

In fanfics, the relationships between characters can be explored in new ways. If the fanfic writer decides to show a rift between Hermione and Harry for the sake of drama, they might create situations where Hermione doesn't believe Harry. This could be due to a series of miscommunications or actions that Harry takes which seem out of character to Hermione.