http://www.nbcchicago.com/news/weird/Chicago-Zombies-March-June-201...

I guess any planned event involving the gathering of a large group of people in one place is  now to be referred to as a "Flash Mob."

May I present to you:

Flash Mobs Through the Ages.

Part one: Old testament era Flash Mobs:

Dudez, meet next Tuesday around 3 between the two halves of the Red Sea, it's gonna be a blast!