What Happened Next
Scorpius and Rose set their wedding date for December 24, 2025: Christmas Eve. Rose never did pick a Maid of Honor, but she sure did have a lot of bridesmaids. They waited until after Christmas Day to go off on their honeymoon. They ended up having two kids, an older boy and a younger girl, and named them Thomas and Bella. They thought naming them after family members would be too controversial.
Gracie and Albus got married three years after Scorpius and Rose, in November. Both Cho and Michael attended, but Gracie insisted that Harry be the one to walk her down the aisle, because he was "the better father" to them both. They had one daughter, her name is Mia Cho.
Abby was present for both weddings, and they were present for hers, too, which took place in the spring of 2029. She married none other than Fred Weasley II and they had one daughter by the name of Brielle Juliet. Abby continued to work at Ollivanders, and was eventually became an acclaimed wandmaker herself. Fred went on to own both The Leaky Cauldron and Weasley's Wizard Wheezes.
Lily gave birth to a baby girl on January 15th, 2026. It took a whole week for Lorcan and Lily to stop bickering over names, and they ended up naming her Vivian. They got married two years after Scorpius and Rose, and one year before Albus and Gracie. Rose and Lilac were joint Maids of Honor. They had two more kids, twins, a girl named Katherine(though she prefers to go by Kay), and a boy named Will.
James and Lina had another son, and they named him Remus Hugo. Lina and Rose, unsatisfied with their careers, open a unexpectedly popular Muggle Bookshop in Diagon Alley, due to their love of classics.
Hugo married the girl he was in love with the last year of Hogwarts, Grace Longbottom. The wedding was November 19th, 2028, a week after Albus and Gracie. They had two boys and two girls, and named them all after family and friends: Frank Scorpius, Charlie Harry, Augusta Lily, and Alice Minerva.
Victoire and Teddy had another daughter, another metamorphmagus. Victoire, in grief for her sister's death, named her next child Dominique.
Lilac married Sam and lived happily ever after with two children, Colin and Mackenzie.
When Roxanne and Emma graduated, they took a grand trip to see the whole world, and then got married when Britain made it legal. They didn't have any adopted or birth children, but prefered to live happily by themselves while watching over their friend's and family's children.
Lysander and Madeline lived as best friends from fifth year on, but a few years after they graduated—when Maddie was an international Quidditch Keeper and Lysander a Healer—they realized they still had feelings for each other and fell in love. They had twins, a son and a daughter, who they named Killian and Jade.
Molly and Lucy both married people they met after Hogwarts, and both had children. They don't live in Britain anymore, but sometimes come back for Christmas to see their cousins and their families.
Louis moved to France and married a nice french girl called Jacqui. They had three children, who all went to Beauxbatons except for their youngest daughter, Adrianna, who attended Hogwarts. She was a veela.
Philippe Nott and his brother George served a life sentence in Azkaban for their multiple crimes.
All was well.