Cold fan?

>>1200399
You want an air conditioner really.
I think some Dyson fans do cold as well as heat? But I wouldn't buy one out of principle

>>1200399
low humidity area? one of those swamp coolers maybe

otherwise a enclosed tent with a A/C and a decent generator (5+KW)

>>1200399
any kind of fan/air movement is good in heat - you start with AC and shit tho, you can probably reconfigure your gennie requirements, cooling for food/drink, etc.? - an HF noise and fumes special aint gonna cut it. You building there anyway, get the power on if poss, my advice.

Misting fan

The only way to make something colder is by moving its heat to somewhere else. An air conditioner does exactly that. You'll need a tent around it for it to be effective and to keep bugs away from the smelly obese folks.

>>1200399
https://www.amazon.com/Orbit-10360-FlexCobra-Flexible-Three-Nozzle/dp/B004INGNPG/
this kind of mister is widely available all over. you can try making an evap/swamp cooler that uses dry ice or something but usually some shade and the misters will drop the temp enough to keep people okay. I would suggest also using astroturf if you're dealing with bare cement/driveway or brick.

>>1200981
oh shit, I forgot about my favorite trick for cooling old/fat people: put all of their beach chairs around a kiddie pool and throw some ice in once in a while. this also keeps them from getting up and wandering around alone.