Since eilia thought I had already made this event up (even though I had told her it didn't work out right), I made a small minigame type booth.

It's kind of like a scratch-card. The user gets to choose which ones to scratch off and if they get three right, they win. I also had another type, where you scratch until you win, basically.

Anyway, I don't know about prizes. All I listed was gil and cards. That's a pretty bad prize set. If you want all gil, then the first method would work better.

Let me know if this sounds feasible, and I'll link you to the post I made about it.