Just make sure to let us know when/where you're having the 40-50+ minors playing...
I will make sure to avoid the game. No offense, but even if the majority of you are good, fair players, I highly doubt that you can get 40-50 minors without at least 4 or 5 blatant @#$holes or cheaters in the group. It's hard to get that many mature experienced players without cheating running rampant, to be fair.
I wish you the best of luck in this endeavor, but please do post up when you're doing this so that the anti-minor folk can avoid you guys. especially since you are making it seem that we (people older than 18) are unwelcome with your "All under 18s are welcome!"