A maelstrom? A seethe? (No no no, that's vampires...)
What do you call a dozen or so gigantic dragonflies hunting en masse over your driveway?
I know what I'd call an under-dressed, repellent-free person who goes outside in an attempt to video them: stupid.
[Trust me, the blurry little objects zipping back and forth are easily 4+ inch long dragonflies. And maybe a close-up mosquito or three.]