My guess is your intended audience, for the most part, won't see your message.
The majority of the people not in their seats on Saturday are the ones that have tickets for the event, not the love of college football. there are lots of them. I talked to a few at my kid's hockey practice on Sunday. A couple "Oh we didn't go, I wouldn't sit through that cold weather" and one "I don't like going to the Wisconsin or Iowa games because of all the idiot visiting fans."
Quite frankly, all those years in the Metrodome really made a lot of people soft. It is going to take the REALLY FUN cold weather victory over Iowa, along with a few more to build things back to the point where A) People actually dress appropriately (lots left at halftime and weren't dressed for that kind of cold) and B) Understand that late season games are often the most memorable ones, thanks in part to the weather.