Hello, Sherry! Thanks for bringing your question to the Disney Parks Moms Panel.
My daughter absolutely adored her
Bibbidi Bobbidi Boutique transformation into a "real" Disney princess on her third birthday, and it's something she still talks about six years later! I'm so glad you'll be able to share this truly magical experience with your first-time Guests, and I'm certain their memories will be just as enchanting as ours.
I stopped by Cinderella Castle tonight and spoke with a Cast Member about your question. She said that since your appointment is right when the Boutique opens, you will need to go around the Castle since the
"Let the Magic Begin" stage show will take place on the Castle stage five minutes before Magic Kingdom Park opens for the day. Since we're more than six months out from your arrival date, we don't know for sure when the performance will be on the day of your Bibbidi Bobbidi Boutique appointment, but since Mickey and his friends will probably be preparing for the show at the time of your arrival, your best bet will be to make your way around the side of the Castle in Liberty Square next to Sleepy Hollow.
If you'd like to browse through some of the shops on Main Street, U.S.A. or grab a pastry and cup of coffee at the
Main Street Bakery before making your way to the Castle for your appointment, Magic Kingdom Park will open to the public one hour prior to official Park opening.
Here's hoping your little princess and her family have a wonderful first visit to Walt Disney World Resort. Make sure to stop by Guest Relations to pick up "1st Visit" buttons for them, too!
Amy