Re: Ventilation is key
"We also know that improving ventilation decreases the viral load which is why it's virtually impossible to become infected in open air settings."
Erm... not quite: Airflow helps disperse the droplets that contain the virus, but it doesn't reduce the amount of virus in each droplet. Larger droplets fall from the air quite quickly and they have the larger quantity of virus particles. Smaller droplets can persist and get blown around more, but have a smaller amount of the virus.
The main cause of viral spread is proximity, and outdoors you have more space so people spread out meaning lower risk of exposure. Crowd together, however, and the risk goes up.
So it's quite possible to catch covid in open air settings especially if you're crowded together, unmasked, shouting or singing or exhaling with gusto.