LAST DAY FOR REFUNDS: Wednesday, August 22nd, 2018 at 11:59 PM EASTERN. After that time all photo op tickets become non-refundable unless a talent cancels their appearance.
Online sales continue thoughout the weekend and each session is available up to 1 hr before the start time of each each session. Remaining tickets are available onsite up until the start time of each session.
Admission is a pre-requisite to purchasing photo ops. If you haven't done so yet, get tickets to Dragon Con 2018 here.
Switching Days: simply create an account at https://epo.io using the email you used to purchase photo ops with, and you can look up your tickets there as well as make changes such as switching the day of the photo ops or sometimes the group.