If you are organising a party, event or other outdoor function, perhaps in a marquee or other temporary shelter, you may wish to consider the hire of portable adiabatic coolers.
Port-A-Cool evaporative coolers are ideal for hot, open, large marquees, for party gatherings, perhaps wedding functions, concerts or corporate functions, graduation and such like on hot dry days. Evaporative coolers are the most suitable form of air conditioning for cooling your event, with the big advantage of Port-A-Cool evaporative coolers being installation-free. It is a plug and play system, at receiving your unit you connect it to 220V (Europe) and waterhose and in some minuts you can enjoy the cool, natural air.
Because it is installation-free you save a lot of money avoiding the need of installation and evaporative cooling is considered very sustainable because of the low level of energy consumption (500W for the 36" unit indicated in the picture cooling 250sqm).