I would add though, that you may want to change the premise a bit. Lets say six to ten people take the time and effort to make a complete NPC sub for the carnival. So, you will select one, and then what? Send a bunch of, "not bad, but no" PM's? hehe. Besides, whoever sends it to you in a PM completed, will also most likely be posting that sub anyway And since it would be an NPC for and inspired by, your carnival, guess which sub they will all be linked too anyway?
*warning* there's a chance you'll get lots
of good ones. And judging many people's subs to come up with one, all by yourselves, seems dunno, a bit cheeky
What if you just post the challenge as a collaborative effort to populate The Carnival of Forgotten Souls, and make a humangous and memorable scroll? Just a thought.