My daughter and I have a trip planned for May, 2014. I booked our room with an AP rate, and I am getting a Preferred Pass to get that hotel discount as well as merchandise and food discounts. I don't think we would be returning during any of the blackout dates, so was thinking of having my daughter get the Power Pass, as we'll already have my pass for the discounts. If we decided later to plan a trip during the blackout dates, could she pay the difference to upgrade her pass to a Preferred Pass? Could this be done anytime during the year the pass is valid? Where would we go to upgrade?