According to the official park schedule, the show is always 5 min before opening time. If the park opens at 8, the show is at 7:55. If the park opens an hour early at 7am for EMH the show is still at 7:55. See March 17th for an example.
Not sure about being able to see it if you are not inside the park. If you are not eligible for the EM, you would not be inside the park.