EPCOT Park Pass reservations are all booked up for Annual Passholders on the opening day of Guardians of the Galaxy: Cosmic Rewind, May 27. However, Annual Passholders will be able to register to preview the attraction before then, and the Park Pass calendar may indicate which days previews will be held.
There are no Annual Passholder Park Passes available on the seemingly random dates of Tuesday, May 16, Wednesday, May 18, and Friday, May 20. Disney may be restricting availability on those days because they will be the preview days. Guests who register for a preview will automatically be given a Park Pass.
Media, Cast Members, and Club 33 members will be able to preview the coaster first, followed by Annual Passholders and Disney Vacation Club members. Registration for the previews will be emailed directly to Passholders.