I think I already posted this, not too sure.
But here goes.
If you do the "Escape Bullworth Academy" glitch on Chapter 1 (Only works for Xbox 360) and go to the Carnival, you'll see the carnival is blocked off.
Could it be the carnival was going to be locked until a later chapter OR was Old Bullworth Vale and Bullworth Town going to be open at the start of the game?
I think Bullworth Town/Vale was going to be open but R* decided to close the gates so the player got accustomed to Bullworth Academy first.