I did this last month, bought it at the ticket counter at MK the day before the party while my Mom was waiting at rope drop. What I wish I knew ahead of time is it applies for the ENTIRE DAY, not just the party. We went to AK in the morning then hopped to MK for
MVMCP. When we got back home and checked the account, we found that ALL photo pass photos taken that day were available for download. Score!!!