You could call the convention line to be sure, but I think you should be fine. Also, I have an AP and dressed up last year for DD, but I bought those tickets for my mom and sister and they decided not to dress up at the last minute and had no problems. They never even asked them any questions. The only time I was ever asked if I was attending DD was by the GCH when I checked in. It could have been just a friendly inquiry or a sneaky way of checking if I was parcipating since I got the discounted DD rates.