I'm in!
As someone who has done the Rebel Challenge (which was an emotional roller coaster) and the Glass Slipper Challenge (which went much better emotionally), congrats on deciding to run at Disney! The race environment is very energized and for the most part, people are supportive. As long as you finish ahead of the balloon ladies, you are more than safe for the challenge. Signing up through a charity is also exciting! I have my trip report for Star Wars in my signature - I'm doing a Dining Report for Princess as I didn't bring the real camera on that trip - just the cell phone.