Winter!: Prepare for holiday gaming!
This one room has been given its own cell. This is not because it is such a large room, but because I expect most players to choose to put their armor mannequins here. A cell can get pretty laggy if you put out 20+ armor mannequins, each displaying a different style of armor.
Technically, you might consider this to be more of a banquet hall or ball room. it isn't strictly located where a great hall is supposed to be. It's high on the tower, just under the master suite, and you get to it through a door to the side of a landing on the main ramp.