Hi Jenny!
I can certainly understand your dilemma, as I have been there myself a time or two!
If Cinderella's Royal Table shows no availability, here are a few suggestions that might help:
1. Call (407)WDW-DINE to speak with a cast member about a reservation. While there is no guarantee, perhaps there could be an opening that is not listed online, you never know.
2. If you do not mind a possible wait, walk-ins are accepted.
3. If you are interested in a similar dining experience, perhaps
Akershus Royal Banquet Hall in Epcot might be a good alternative.
If Bibbidi Bobbidi Boutique at Magic Kingdom is not available, it won't hurt to check availability for the Downtown Disney location.
I would recommend checking online and calling periodically to see if there are time slots available before your visit. I hope this helps.
Sending lots of "pixie dust" your way! Have a
magical time!
Raquel