No, there are certain events where the Fort locks down. Typically, it's for the 4th of July parade, the Halloween parade, and Halloween night. Typically on those nights, the only people allowed in the Fort are those staying there on a Fort reservation.
I think that if you are in the Cabins, you will be considered at the Fort, but I suspect that those staying at LL will not be considered "at the Fort" for the purposes of the above events. It's one reason why I am leaning for LL to be in a different association than CFW. I just don't see any way to let all of the LL guests into the Fort for those events. I suspect that they'll have some sort of checkpoint on certain days by Crockett's tavern and then by Tri-Circle-D ranch controlling flow both ways, but I could be wrong...