Well, you know what? at UK festivals now, its usual to get a fly by from the Red Arrows, who spray crap at low altitude over the event in PYRAMID formation. I saw the cram sink slowly to ground. Who knows whats in it. And last time I went to a festival, I saw heaps of spraying and, on one day, we had spiders and spider webs falling to the ground. I since discovered that spider webs were used to disperse biological components. Put simply, any mass gathering of people's now is seen as a green light by the authorities to use weapons against the people.
Conversely, one year, I went to a Christian festival where rain was forecast the entire period, but the event was SURROUNDED by cloud, 360 degrees, all festival. I don't believe in co-incidences.