I don't think the stands will be full to be honest. A lot of people have to be back to work Monday morning after long holiday vacations, it's going to be freezing, and a lot of fans think the Bengals are just going to lay down and make the game unwatchable.
Towels have to be green and white otherwise if they are all white, it will look like 70K waving white surrender flags.
http://www.newyorkjets.com//image_assets/10079/122909_win_and_were_in_rally_towel_320.jpg picture of the towel