I don't think there is a sure fire way. First of all I would get your children birthday pins. If at all possible get in the park early with PS before the park opens. We were picked one year. I had my Birthday pin on, my dh and I both had on Xmas mickey hats and we were in the park early for the keys to the kingdom tour. We decided to walk up main street for some pictures when we were approached and asked to be in the parade. Good luck.