Are you on MU? If not you should go there for your EPIC HUGE SECRET GAME. They really have the player base for the kind of game you're imagining. You'll likely need to host one standard game first because I don't think they allow people to host mashes without one standard game under their belt, but your game really needs like 30+ players to work like you're envisioning.
It also needs to be labeled as experimental, but they love that sort of stuff over there.
Yeah he is he actually subbed into sports mash but subbed out before posting ---