The key is to move down to the field level if possible. Get as many black shirts down low for every play. Also behind the goalposts.
Also, if you guys started a "Save...Our....Chiefs" chant during our first offensive drive, that might be effective.
Finally, if people who are walking the parking lot have garbage bags to hand out to people who might not have heard or might not know, you might be able to convince people to just wear the bags over their jerseys.
Either way, I'm rooting for you guys!