Wow aug0208, you have a big group!! As Jacy said, they don't let you do a rehearsal dinner without extra charges...however, we spoke with our WC Sandra when we got onsite and she talked to the head waiter to see if they could do anything. We were able to get our own section of the World Cafe right when the restaurant opened at 6pm (no extra charge). We had 29 people total, including DH and I...and our little corner at the World Cafe worked out fine. Service was a bit slow though.
I think that since tourism is down they have a little wiggle room with trying to accomodate you. Dinner at World Cafe is sometimes menu sometimes buffet..it depends on the day. Our "rehearsal dinner" fell on a Wednesday and luckily it was a menu day. Hope that helps!