Want a good deal on a banquet room? Rent it on any night besides Friday or Saturday, because that's when everyone wants to rent one. That means the price for those dates will be as much as the market will bear. You're likely to get a much better deal if you book it for midweek.
Whats the difference between a "banquet room" and a "banquet hall"? The terms are often interchangeable, though in many cases a banquet hall is built to host dozens or hundreds of people. Facilities advertised as banquet rooms tend to be cozier.