If you are staying at a Walt Disney World Deluxe Resort, you might have a third chance to join the Virtual Queue for Guardians of the Galaxy: Cosmic Rewind. With Extended Evening Theme Park Hours (currently offered on Mondays) you can try to join at 6:00! You do not need to be at Epcot in order to try for a spot, but you do need valid theme park admission.
Here are Parts One, Two, Four, Five, Six, and Seven of this series.