Xbox builds pop-up hotel for gamers, rooms got booked out just hours after announcement.

[AlfredoTurkey]

SvennoJ said:
What the heck is a pop-up hotel, is that like a flash mob. I'm old.

Sort of. They're basically corporate-owned events that "pop up" temporarliy in the hopes of selling stuff... or in this case... promoting stuff. Bands have been doing it for awhile now.