The Minnie and Friends character meal at the Plaza Inn start 50 mins before regular park opening on days when there is Early entry/Magic Morning. If they regular park opening is 8, they will let you in at 7 as soon as they start letting all the MM/EE folks in. So it is not the same as in the park isn't empty. It is, however, a great use of time if you don't have EE/MM. We love to get to the Plaza as soon as they let us in at 7. It doesn't get crowded for the first 15 mins or so and the early character interaction is great. And we are out and ready to hit the park and not stand in those awful lines at the gate at 8.