I'm a transplanted Buffalo fan in NJ.  I don't know exactly what kind of festivities you're looking for, but there is a pretty cool one called Jetspack.   I forget the exact section of the parking lot, but it's on the SW side of Giants Stadium.  As of 2 years ago, you pay 10 bucks and there's food and a keg of beer, they'll even feed a Bills fan although they gripe about it and you don't have to "know" them.  Everyweek is a theme (Chinese, Mexican, etc.), and the Thanksgiving day one is as good as eating at Grandma's.