Runners nationwide have their first chance today to go after a commemorative new medal that will be awarded to finishers of the 2013 Disney’s Princess Half Marathon. Registration for the race weekend opens today and all finishers will receive a one-of-a-kind medal to mark the fifth anniversary of the women-focused event at Walt Disney World Resort, Feb. 22-24, 2013. Runners can sign up for the race at www.rundisney.com and the commemorative tiara medal will be revealed in the coming months.