Westgate Entertainment District is right next to the stadium. I would assume most of the establishments will be open before and after gameday, even on Christmas. There are multiple places (Buffalo Wild, Salt, Yardhouse, Bar Louie, Fat Tuesday, State 48 Brewery, Carousal Bar, Lola, etc...). The surrounding area also has a Twin peaks and Dave & Busters.
The great lawn area, in addition to the fan tailgating, also has two public establishments (BetMGM Sportsbook and Heritage @ Sportsman's Park Beer Garden).