Well, I think Effie would be there. She has been with them through a lot in the Capitol. Even though she was part of the system that oppressed them at first, she has changed. Also, some of the rebels who fought alongside them in the war might be guests. They see Katniss and Peeta as symbols of the new beginning. And the Capitol stylists who have worked with them, like Cinna's team (if they survived), would also be there to celebrate this new chapter in their lives.
In addition to their close friends and family, some of the other victors might be invited. People like Finnick, who has become a good friend to them. Also, the people from District 12 who have supported them during their difficult times. There could be some of the children from the district too, as Katniss and Peeta are seen as role models for them. And perhaps some of the Capitol citizens who have changed their views after the fall of the old regime and now support their union.
Their families would definitely be there. So Katniss's mother and sister Prim, and Peeta's family. Also, their friends like Gale, who, despite his complicated relationship with Katniss, would come to support them. Haymitch would also be a guest, as he has been a mentor and a friend to them throughout their time in the Games.
I think Haymitch would play a big part in planning their wedding. He's been like a mentor to them and has seen them through so much. He'd make sure it was a safe and comfortable event. He might not be the best at the frilly details, but he'd get the important things right, like security and making sure there's enough food and drink.
Katniss might become more open and less guarded. With Peeta by her side, she could start to trust more easily. Peeta, on the other hand, might become more assertive in protecting Katniss and their new family. His gentle nature could still be there, but he'd have a newfound determination.
They would become more united as they have a new life to protect. Their focus would shift from just each other to their baby, and they would work together even more closely.
They might have some disagreements, like how to raise the child. Katniss, who has grown up in a tough environment, might have different ideas compared to Peeta. But these differences would also help them understand each other better. They would communicate more and work through their issues together, making their relationship more solid.
Well, their wedding could be a very private event. Since they've been through so much in the public eye, they might want it to be just for them and a few select people. Katniss would have her hair in her signature braid, and Peeta would hold her hand tightly throughout the ceremony. The vows they exchange would be deeply personal, talking about how they've saved each other's lives in more ways than one. The wedding would also be a chance for them to show that love can survive even the harshest of circumstances, like the deadly Hunger Games.
Obviously, their close friends from Hogwarts would be there. Ron and Hermione would be among the guests, as they are Harry and Ginny's best friends. The Weasley family in its entirety would be present too, including Molly and Arthur. Luna Lovegood would surely be invited, with her unique charm. And Hagrid, who has been like a father figure to Harry in a way, would also be there to celebrate this happy occasion.
The guests would include their closest friends and allies. Nico would be there, having finally come to terms with Percy and being part of their group. Rachel Elizabeth Dare would be there as well, since she has a connection to both of them. The centaurs from the forest around the camp would also be invited, like Firenze, who has always been a bit of a mentor figure. And the minor gods and goddesses who have helped them on their adventures might also make an appearance.
Peeta would probably be very nurturing. He has a kind heart, so he'd be great at taking care of the baby's basic needs like feeding and changing diapers. Katniss, on the other hand, might be a bit more cautious. She's used to being in survival mode, so she'd be constantly on the lookout for any potential threats to the baby.
Well, in a fanfiction, their wedding might be a grand event. Since they are so famous in their world, people from all the districts might come to celebrate. Katniss would look stunning in a dress made of some unique fabric from one of the districts. Peeta would have a custom - made suit with little details that represent their journey. There would be a big feast with all kinds of delicious food. And for the first dance, they would choose a song that has special meaning to them, like a song from their childhood in District 12.
The guests could include Percy's closest friends from Camp Half - Blood. Grover would be there, his presence adding a touch of nature and music. Annabeth would be there to support Percy and also to share in the joy. Some of the younger demigods from the camp who look up to Percy might also be invited. As for Calypso's side, the various nymphs on the island would be present. The talking animals and magical creatures that inhabit the island would also be part of the wedding. And perhaps some of the friendly sea - creatures that Percy has befriended over the years would come to the surface to witness the event.