A thing a lot of people don't know is that Big Whoop and the whole carnival were not important in his plans for MI 3.
There's a whole interview at SCUMM BAR:
Where, he talks (well, hints) at what he wanted for MI 3.
Quote from Ron:
"No, because Big Whoop wasn't really anything important when we started writing the game. The name alone says that. It just turned into something after the fact...Like I said before, I didn't really have any plans for Big Whoop. I didn't think people would latch onto it, so it was never a part of my story."
So the idea that the carnival would play a big part in Gilbert's MI 3 is probably wrong. Also Elaine and Guybrush wouldn't have gotten married.