They decide to have a private wedding ceremony, and then celebrate with family after. So in the Windenburg chalet gardens there is only one wedding spectator (unless the ghosts are watching from the castle).
https://i.imgur.com/emGbXMl.png
https://i.imgur.com/F8hqS22.png
Married!
Then they meet up with Jonatan's family for a celebration dinner in San Myshuno.
https://i.imgur.com/q7KziQW.png
https://i.imgur.com/cm0lPGs.png
They stay late and have lots of food and wine. A great way to celebrate a marriage!