A friend of mine has decided to join us last minute. We have parkhoppers and are planning to start in DCA on October 13th and Disneyland on October 15th. If she buys a parkhopper, she can only make a reservation for DCA on the 15th. If she buys regular tickets, it's the opposite -- she can only make a reservation for Disneyland that day. Do you think she could buy single-park tickets, make her reservations, then upgrade to a parkhopper on our first day?