Well, it could be that the queen summons Harry Potter because she has somehow learned about the existence of the wizarding world and needs his help. It could be to deal with a magical threat that has seeped into the Muggle realm. Harry would then have to figure out how to use his magic in a Muggle - dominated place while also respecting the queen's authority.
In this fanfiction, perhaps Harry Potter would be in a state of great confusion when summoned by the queen. He might initially think it's some kind of dark magic trick. Maybe he'd be worried about leaving his wizarding world duties behind. And he'd likely be very curious about the Muggle royalty.
In this fanfiction scenario, Harry could bring a touch of magic to the royal court. He might introduce some magical creatures to the royal gardens, like a friendly unicorn or some magical birds. His Gryffindor courage would make him stand out in royal events, and he could inspire the younger members of the royal family to be more brave and adventurous. Also, his experience with fighting dark wizards could be applied to protecting the Queen from any potential threats, magical or not.
Well, perhaps Harry Potter could use his magic to solve some sort of mystery in the Queen's palace. Maybe he'd help protect a valuable magical artifact that was in the Queen's possession without her knowledge of its true nature.
If Harry Potter gets help from the Queen in fanfiction, the Queen could offer her strategic wisdom. Given her experience in ruling and dealing with various threats, she could help Harry plan his battles against Voldemort. She might also introduce Harry to a network of powerful Muggles who could support his cause in different ways, like providing financial aid for the Order of the Phoenix or helping to spread anti - Voldemort propaganda among Muggles.
Well, in the fanfiction, Harry might be extremely nervous when he meets the Queen. Maybe he stumbles over his words while trying to show respect.
Perhaps there's a member of the royal court who is secretly envious of Harry's power and tries to undermine him. This person could be plotting against Harry and trying to make the queen believe that he is a danger rather than an asset. They might spread false rumors or create false evidence to get rid of Harry.
Well, he might be quite astonished by the grandeur of the Queen's palace. Maybe he'd try to use his magic subtly, but end up causing some minor chaos, like making the guards' hats fly off accidentally.
Well, in this kind of fanfiction, perhaps the Queen uses her power and resources to rescue Harry Potter from a dangerous situation. Maybe he's trapped in a dark wizard's lair and the Queen arrives with her guards to save him.
Well, he might grow up in a very different environment. He could be educated in the best private schools, learning not only magic but also all kinds of royal etiquettes. And he would probably have access to a whole new set of resources, like ancient magical artifacts hidden in the royal collections.
Well, it could be that the Queen has a special connection to the wizarding world in this fanfiction. Perhaps she has been secretly informed of Harry's bravery and selflessness all along. And as a symbol of the British monarchy, she knights him to show that the Muggle and wizarding worlds can have a positive relationship. So, she bestows this honor on Harry.
Well, he might be given a dangerous mission. Maybe he has to infiltrate a Death Eater stronghold or protect a crucial magical artifact.