Hi to all you extremely knowlegeable GF folks

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I'm looking for suggestions on what to do about an upcoming trip. Here's the story:
I have the GF booked (GV) for 7/24 and 7/25.
We will be on the Disney Wonder 3 night cruise 7/26 - 7/28.
We will be returning to the GF(again GV) on 7/29.
Here's the problem ... I am still trying to add on the night of 7/30 and have had no luck. I really need to do something at this point as we will be flying home on 7/31. I do have a 1BR at BWV for the nights of 7/29 and 7/30 just in case, but I really have my heart set on the GF !!!!

This is a huge surprise for my mother who has always dreamed of staying at the Grand

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I find it so odd that on the night of 7/29, every single type of room is open for booking - from GV to 2BR suites, including Royal Palm Club !!! I was even able to reduce my room rate and apply a room only code to my reservation ... last night !! But the night of 7/30, nothing at all is available ???
Does anybody have any thoughts on why this night might be so hard to get? I'm wondering if it has anything to do with them holding back rooms due to the current situation at AKL and relocating guests???
Have you had success in getting a room added on to a reservation in the past ? If so, how did you do it?
Thanks for your advice !