In some fanfictions, the wedding might be in danger. Maybe Voldemort's remaining followers try to disrupt it. This would lead to an exciting showdown where Harry, Ginny, and their friends have to use their magic skills to protect the wedding. It could also be a chance for Harry to show how far he has come since the end of the war, using his leadership and power to keep everyone safe while still enjoying his big day.
Another possibility is that they would take a stroll in the moonlight around their new home. They would hold hands and reminisce about their adventures at Hogwarts. Harry might tell Ginny how much he loves her all over again, and Ginny would respond with sweet kisses, and then they would go back inside to have a warm drink and cuddle by the fireplace.
One interesting scenario could be that the four of them have a combined bachelor - bachelorette party. They go on a magical adventure together before their weddings. During the weddings, the Marauder's Map could be used in a creative way. Maybe it shows the location of all the guests with a special message for each of them. Another thing could be that Neville could be the one to officiate at least one of the weddings, adding a unique touch.
One romantic scenario could be a ceremony in the Forbidden Forest. The trees are magically lit with twinkling lights, and the centaurs are there as silent witnesses. Ginny walks down an aisle made of wildflowers, and Harry has a look of pure love on his face as he sees her.
One interesting scenario could be them renovating their home at the Burrow. Harry might use his magic to make some unique changes, like creating a hidden room for his memories of his parents. Ginny could be in charge of decorating, adding a Quidditch - themed corner. Another could be their travels. They might visit different wizarding communities around the world, learning new spells and making new friends.
One interesting scenario could be them exploring hidden parts of Hogwarts together. They might find a secret room filled with old magic artifacts that have been long forgotten. This could lead to an adventure where they have to figure out how to use or protect these items from falling into the wrong hands.
One interesting scenario could be that they have a dinner by the lake at Hogwarts. Ginny might have prepared all of Harry's favorite foods, like treacle tart. They could be reminiscing about their adventures at Hogwarts while enjoying the meal.
One interesting plot could be the inclusion of magical elements in the wedding decor. For example, floating candles that change colors according to the mood of the couple. Another plot might be the presence of unexpected guests, like a long - lost wizard relative of Ginny's who brings a special family heirloom as a wedding gift. Also, a plot could revolve around Harry and Ginny's nervousness before the ceremony and how they overcome it with the support of their friends.
In some fanfictions, they could be studying together in the library but also stealing glances and little touches. It adds a cute and romantic aspect to their relationship while still being in the Hogwarts setting. For example, Ginny might help Harry with his Potions homework, and they end up sharing a sweet moment over a difficult potion recipe.
Well, in some fanfictions, a great scenario is when Harry chooses 'dare' and Ginny dares him to go into the Forbidden Forest at night without his wand. As for truth, Ginny might be asked the truth about whether she ever had a crush on one of Harry's friends. Also, Harry could be dared to imitate Professor Snape's voice during a truth or dare session.
Another scenario could be them working in the field of magical creature conservation. They might team up to save an endangered species. Harry's experience with magical creatures like Buckbeak and Ginny's love for all things magical could lead them to create a sanctuary or a breeding program for the creatures.