On the 7 night or longer cruises on board the Disney Magic and Wonder you used to be able to enjoy a gala dessert buffet. This was usually on the Captain’s Gala night, which should be the night before the last one. This also was a semi formal night. In the restaurant you have a more special menu (with lobster for instance).
The buffet was in Lumières (Disney Magic) or Triton’s (Disney Wonder) around 11 pm. There has never been a gala dessert buffet on the new ships. After the second dinner seating everything’s made ready by the servers. In the long corridor near the main entrance there’s a long table filled with sweet things like cakes. At the end you can find fruit, marzipan, nougat, … for in the chocolate fountain. Everything’s beautifully decorated too.