Not an original idea, but still so much fun.
Just attach LED lights to a kite any way you can then find a windy spot and keep kids (and yourself) entertained making bright colourful patterns in the sky.
For my kite I just attached keyrings to the eyelets that the strings attach to. In future I hope to make a kite with built in lights with a removable battery pack.
Have fun and brighten up the sky near you.