If you're not providing snacks, you might as well not even be having people over. People will be leaving your house faster than a Miley Cyrus concert. What you serve is up to you, but the favorites are buffalo wings and nachos. You can even have traditional hamburgers and hotdogs - if you choose to. Most people are too busy watching the game, but when hunger calls they'll be expecting something to calm the hunger pains; especially if they're kicking back beers. Start preparing the food hours before the game, around noon. That way you can get more fixed and have time to set up everything else. Keep the food in the fridge and pop it back in the oven to reheat when the game starts.