... boxing matches? That's his game? [What a dumb idea. What would be the point? There's no money to be had.]

Well, I don't know what to tell you about prizes, but the only place worth having it as is the Dome. First of all, so you don't have to go commissioning a stadium. It'll help for getting fair fights too. Unless you're packing some superhuman powers, you're asking for a thrashing if you just go challenging any shmuck around here.