I have been having many of these same thoughts...80,000 people in a stadium for a football game, 10 Obola carriers...There could be 800 to a 1000 new cases by the end of the game...If this is not stopped soon, it will probably become illegal to congregate in any fashion...
There are possible vectors in supermarkets touching produce, spraying droplets in crowds, etc. I think in the stadium it would have to be sprayed. It won't just float around through the air from person to person. If it did that, half the people in West Point (Monrovia) would be dead.