itch.io

It seems to just happens at random. Also (as far as I remember) it seems only to trigger when entering the dorm at the afternoon or evening.
But I cant say when it happens, as I had a run were it happend during the second week, but also one, where (I belive) it happend at the third day.

The quad party starts up in the second week of classes, and you should get the invite toward the end of that week as an event in the residence hall.