Actually, I have dealt with Walt Disney World for several private events. I can't speak for Disneyland but WDW does send out contracts that are very basic and broad. Unless you "beef" up the contract to your liking, they
can try to pull this over on you. And of course they will do the good ol' "This change in policy is coming from higher up and we have no control over it." That is when you pull out big guns and you speak with the higher ups and
negoitate. It can be done but you really have to be ready not to take no for an answer.
And as for locking in the pricing, you should have received a proposed budget?
Good luck!