Hi Amber!
Wow! They'll need to change the name of the salon to the BBBB - The BUSY Bibbidi Bobbidi Boutique!
That's a lot of Princesses!
Having all 7 girls "coiffed" prior to the usual 10:30am start time at
My Disney Girl's Perfectly Princess Tea Party may be a but ambitious ... but not necessarily impossible! I'd recommend first calling the BBB at (407) WDW-STYLE to see how many openings they have EARLY in the morning on the day(s) that you can fit this into your itinerary. The Cast Member will simultaneously check Princess Tea's availability for you and you'll be able to determine if it's a fit. Your best bet would be the Magic Kingdom BBB location as it is closest to The Grand Floridian.
Keep in mind of course, once the Boutique experience is finished, you'll need to allow travel time to take the Monorail or Resort Launch over to The Grand Floridian. If this proves to be an impossibility given the number of simultaneous appointments you require, don't worry! The girls will definitely still have a ball if they enjoy the Tea the following day instead as most Princesses tend to be able to get a second day out of their beautifully styled hair!
If you'd really like a Princess dining event to coincide with the same day as the girls' BBB appointments, I'd highly recommend reserving
Cinderella's Happily Ever After Dinner at 1900 Park Fare for that evening. It ties in very nicely with the 'all done up' look. We've always dined there with our Princess following her Bibbidi Bobbidi appointments and thoroughly enjoy watching Cinderella & Prince Charming dance at 'the ball' along with the antics of Cinderella's family as they visit our table.
Wishing you a Magical time at Walt Disney World with your entourage of Princesses Amber!
Kirsten