My Plebe changed rooms and roommates TWICE just during Plebe Summer. No change during first semester bur rumor is that they will change both rooms and room mates for second semester. Also, the Brigade goes from 30 companies to 36 next year, so lots of changes in store at end of this semester.
No information on staying in Bancroft night before I-Day, but I do have a story from this past I-Day. As we were viewing the swearing-in ceremony on I-Day, my younger son heard an out-of-breath young man ask a detailer who was standing close by what he should do about reporting. It seems that his flight was delayed in a major way (was supposed to get to Annapolis on I-Day eve) and he had just gotten to the Yard! The detailer said "follow me" and they both rushed off toward another entrance to Bancroft. Of course, we don't know how things turned out for the young man, but it is a lesson-learned about the importance of pre-planning.