ok it was 1995? I was at a con and my 15 ish nephew and I went to visit an old froend of mine who was about to start a run. He was running"Cthulhu by Candlelight" and the game was for 4 players. When I got to the room , the con had overbooked him by SIXTY players! One thing lead to another and I told the frazzled con representative, that I would run, if he gave me prize support. He quickly agreed and asked how many players, in a sudden decision I said "TWENTY!"
On the way with my 20 players and my nephew agreeing to co DM we plotted a game about an aircraft over the mid atlantic with a horrible artifact in the cargo bay. We came up with 20 roes and off we went
The game was amazing , the players were grateful I was willing to tun and got so into it that as I slowly killed them off , every single player who dies laid on the ground playing dead( it turned into a larp). It was amazing RPing on the part of 21 strangers. 21 you say?. A guy had come off the street (a non gamer) and weaseled his way in. The winner was our stewardess who had an unshakable lack of fear as an ability. Also of note were the white south african and black american mercenaries who were unshakable buddies. ( The black American was played by our interloper)
At 21 players it is by far the largest group I had ever run. It was one of those times when it all just came together