random events

So I have a Halloween map I want to get back to making, and I wanna put everyone's favorite pumpkin headed, axe-wielding maniac. I have it set up where he spawn in after a random amount of time. Only problem is, if enough time goes by another one might spawn. How can I make it so only one can be...

What is koth_monopoly? koth_monopoly is a Koth map with a luck element, besides the normal koth play pattern, there will be positive and negative events that affect teams. so "koth_monopoly will decide your fate" ... (get it?) Just like regular monopoly, dice can be rolled and "pawns" played...