Nobody will actually remain in their own rooms, they'll all be switched around into the empty tents available. And they'll all find themselves with a new bed partner!
We had the switches randomized, so here's the list again:
( List )
They won't be able to leave the room they're put in, not until they manage to sleep in the same bed for at least a few hours, so have fun with that! If your characters fail to realize this is what's needed, eventually Kiseki will send one of its usual creepy mental messages to let them know.
As usual, feel free to ask any questions.