Definitely visit the Strip District, you could even go there Saturday morning before the game.
Good options for food there are Wholey's (a grocery/fish market that has a restaurant are in the back corner that serves fish sandwiches, lobster mac and other seafood), S&D Polish Deli (kielbasa, pierogi, etc), and Peppis (subs and sandwiches). Plus there will be street carts selling other various options and a number of markets with cheeses, meats, olives, etc. This is also the original location of Primanti Bros which I personally think is overrated and would put the places I listed above it.
Fat Heads on East Carson is another good option but its on the Southside and a little far from the stadium. Lots of other great places on Carson also.
If anyone is in town Thursday night, I'm going to be hanging out at the Hofbrauhaus getting a early start on Oktoberfest. Come on by for a few liters of german bier.