I too, would like to know if anyone has had success on this...I tried to add Sept 30, we are going Sept 22-29 currently with free dining at POP. The first time I was flat out told no. The second time the CM tried calling "guest services". After holding about 10 minutes she came back and said not available, but they would have done it if it was available. She said I could keep calling back and trying, didnt mention anything about a change fee.