Hi Eric!
With a bunch of girls, a princess meal is a MUST-DO! Their faces will absolutely shine when they get to meet their favorite princess!
A princess meal that I can highly recommend is
Akershus Royal Banquet Hall at the Norway Pavillon in Epcot. Here you can meet a quite a few princesses while you are treated like royalty. Another great option is
1900 Park Fare which is located at the Grand Floridian. Dinner here features Cinderella, Price Charming and, most nights, the evil step-sisters. Its a fun, relaxing place to have a great meal!
Since you are fairly close to your travel time, please don't be discouraged when trying to set up a meal for your large group! Persistence often pays off when making Disney Dining reservations. Be sure to check, recheck, and check again for openings - the online reservation tool is great for this. As vacations draw closer, people often change reservations as their vacation plans firm up. Also, you may consider breaking your group into a party of two or three if possible. This may help you find some availability.
Last but not least, for a fun Quick Service lunch, be sure to check out the
Be Our Guest restaurant in the New Fantasyland. While you won't be dining with characters, it is definitely fun to dine at Beast's castle! This place is astounding! After lunch, you can head next door
Enchanted Tales with Belle for a fun, interactive character meet & greet - I'm sure the girls will love it!
Enjoy your trip!