Welcome back, Angie!
So happy to hear from you again. It's definitely a good thing to send in all the questions you can as you plan and prepare. Knowing what to expect offers some peace of mind when taking on a new Disney vacation experience; runDisney is no exception.
For 2015 there were approximately 12,000 princesses, and a few princes, that took part in the magical 6.2 mile journey during the
Enchanted 10K. As far as its sellout rate, well, it went faster than Cinderella's race out of the castle at the stroke of midnight. Meaning, it sold-out fast and is expected to sellout just as quickly for next year's event. My biggest piece of advice to ensure your spot in this royal race is to be on the homepage for the Disney Princess Half Marathon Weekend on the runDisney website on Tuesday, July 14th at Noon, EST to register. Also, if you happen to be an Annual Passholder or Disney Vacation Club® Member, you are entitled to register early! As a member of both myself, that perk has really come in handy with these quick sellouts. I also suggest if you plan on running with friends or family, each person in your party complete their own registration.
Please don't hesitate to reach to me again, Angie! I'm here to help you plan a very magical runDisney-cation.
Faith