So I bought 2 day tix for January. Bought recently for a marathon week trip I've had booked, via DVC, for several months. Last night I booked a DVC stay for Dec. I'd like to move my 2 day tix to the Dec trip as I suspect the marathon will be cancelled and then we won't go. But the tix are dated tix for something like Jan 3-7. I go on MDE and click to 'change' the tix but it gives me error message. I do have park reservations booked. If I cancel those will it allow me to swap to Dec dates? Do I have to call in? Or is it not at all possible to swap dates?