If you read the his first post it looks pretty well planned to me, just needs to pick an exact day. Forget discord just show up and the day and time keep it simple. If 50 show up its pretty much every man or woman for them selves once it starts, you die your out. Still out of 50, some may actually make it pretty far unless some mage just aoes them all, having 60s come along to watch the show and protect wouldn't hurt.
Ive seen horde do this with low lvl undeads hordes of them, good stuff, just to see how far they get.
Fun little idea you have here, to bad people don't like to have fun. Id probably miss it unfortunately unless you did it like 10pm central NA time instead of server time.