I currently have a Preferred Room booked at ASM for 4 nights, base tickets for 6 days, and DDP for 3 adults and 1 child. I was considering upgrading my ticket to an AP during my trip in December 2019, so that I could justify coming down for some RunDisney events in 2020.
Question: If I purchased an AP now and re-booked the room, could I purchase tickets at Undercover Tourist for the rest of my party and still add the DDP for all of us because I would be a passholder? Has anyone done this? Or is that not how it works? Would the AP start when I purchase it or when I go into the park on the first day of our trip? Thank you!