To make the dome roof look a little more festive and not a cavernous as another fan put it. Why not add some orange and blue lights that shine on the dome roof and turn it from grey to Orange and blue.
Also, I posted previously about real grilled food stations outside the dome at each gate with real grilled Hoffman hot dogs, Gianelli Sausage, good burgers, Kielbasa, real deep fried fresh cut french fries, chicken tenders, etc. That way you don't have to worry about fume hoods and indoor health dept bullcrap and the food would be real and not steamed.
Just like you allow people to go out and smoke at certain gates, let people go out and get real food at each gate and re-enter. I think you would be amazed how it clears the concourse during halftime, gets people real food and gets them back in the game. If a few people sneak in during that time so be it, more people cheering for the orange.
Just a thought and wouldn't be expensive as you could contract out the space to different vendors and make money.