Some fanfictions might even pair Harry with a new character. For example, a foreign witch who comes to Hogwarts for an exchange program. She could bring a new cultural element to the story and her relationship with Harry could be based on their shared love for magic and exploration of different magical cultures.
In this fanfiction, it might be that Harry is in Vegas for a bachelor party or just a solo trip. He stumbles into a situation where he meets a girl. There's a lot of fun and chaos in Vegas, like partying at the casinos. Amid all this, they fall in love quickly and get married. After that, they have to figure out if their relationship can work outside of the Vegas bubble.
Well, Harry could marry one of the veelas. Given their beauty and allure, it would add an interesting dynamic to the story. Their relationship could involve Harry having to deal with the jealousy of other wizards and also the cultural differences of the veelas. Or he could marry a descendant of one of the founders of Hogwarts. This would tie in a lot of Hogwarts history into their relationship, and their wedding could be a grand event that unites different factions within the wizarding community who have ties to the founders.
Well, one thing that could happen is a really chaotic wedding. Maybe all his wizard friends show up in Vegas not quite understanding the Muggle ways. For example, Hermione might be constantly trying to figure out how all the Vegas magic tricks are done, thinking they're some kind of new wizardry. And Ron would probably be more interested in the food and drinks at the casino. Harry, on the other hand, might be a bit overwhelmed by the whole flashy Vegas atmosphere but still be happy to be getting married in such an unusual place.
In some fanfiction, Harry might get married in a secret ceremony to protect his family from a new threat. His friends would be the only ones in on the secret. The wedding could take place in a hidden location, like an ancient, enchanted forest. His wife could be a powerful witch who has her own secrets. Their marriage could be a key part of a bigger plan to defeat an emerging evil. There could be a lot of mystery and intrigue surrounding their relationship, with them having to keep their true feelings and intentions hidden from the outside world.
Maybe in the fanfiction, Harry's marriage is a political move within the wizarding world. He marries someone from an important pure - blood family to help unite different factions. This could lead to a lot of drama as he has to deal with the politics and also keep his own values intact.
One character could be Harry, of course. The other main character could be a singer named Ava who is performing in Vegas. She's got a big heart and a wild side. There could also be a Vegas local named Jack who befriends Harry and kind of guides him through the process of getting married in Vegas, giving him local insights.
Well, maybe Harry goes to Vegas on a whim. He meets someone special there, like a girl who is also there for a wild adventure. They fall in love quickly and decide to get married in one of those kitschy Vegas chapels. Then they might face some challenges as they get to know each other better, like finding out they have very different lifestyles.
Since it's in Vegas, there might be some unexpected guests. Maybe some of the Vegas magicians mistake Harry for one of their own and try to include him in their act during the wedding. The wedding cake could be a multi - tiered monstrosity, with each tier having a different magical or Muggle - inspired decoration. For example, one tier could have Hogwarts castle made out of icing, and another could have the Vegas skyline. It would be a wedding that combines the best (and maybe the silliest) of both the wizarding and Muggle worlds.