This happened a couple of years ago for Veterans Day in Green Bay.
Those who attended the game said it was extremely emotional to see the entire bowl of the stadium turn red, white and blue. It took 90 workers two weeks to get all of the colored card boards mounted under each seat. Each piece of card board had eye slits in them so the fans could hold up the colored sheet and still see through the eye slits. Every seat had to have the proper card, with no mistakes, to make this happen.
This is what ESPN failed to show you Monday night, Apparently, they thought their commercials were more important than showing this scene for about 5 seconds.
Thanks to Bruce Lattimer!