Inside Yana's castle was a wild mix of styles and even species. Some people had taken her directions to dress up
very seriously, sparkling and bordering on formalwear, while others --
ahem, Holly Black -- hadn't bothered at all. Some weren't even people, although they did a good impression of being people, at least at the beginning of the night. As the party went on, it got a little bit more obvious which of the people you hadn't seen before were new students and which were demons in disguise. And of course there was Boogers, all dressed up in a half-suit and tie, giving everyone a good sniff before letting them inside and looking very pleased with himself.
The drinks had all been brought over from the human realm, but a few of the demon guests had smuggled their own flasks in, so partygoers accepted drinks from strangers at their own risk. And made out with strangers at their own risk, too, since some of the demons were a little...
toothier than others. With Yana, Sapna, and Ananym all on hand nobody was actually going to get eaten, but they couldn't make any promises about nibbling.
The party would last until morning, or until everyone had gotten tired and gone back through the portal home, whichever came first. Most likely morning. Even if the Xavierites were ready to crash out, demons knew how to party.
(Rapid-fire, open to everyone!)