On the football stadium itself, there is a lot of debate and no clear answers. Stadiums use pretty efficient lighting, and certainly air conditioning is not likely to be an issue in the dead of winter. So using the low end of estimates, an average stadium might use 10MW of energy for five hours, or roughly 50 MWh for the game.
Outside of individual's holding crude oil stocks, damage to the economy from the fall in oil has been pretty minimal so far. Indeed, the price cut in home heating oil and gasoline has probably outweighed the damage from lower oil prices, so far. Unfortunately, this situation may not last.