The buckhorn is not downtown. However, it has a lightrail stop, just two stops from Invesco Field (south), so it is easy to get to.
I am pretty busy at work these days, but I might be able to organize a tailgate. I'm not sure what we would need, or how much but if someone will help me, I bet we could get something together.
I just switched jobs- I now work at the Coors Brewery. I might be able to help with beer for the game, and tours of the Brewery if anyone would be interested.