Since your reservation is after park opening, you'll be allowed to enter when everyone else is for park opening. Sometimes that's a little earlier than scheduled, but if there's a welcome show scheduled, it will be after that. (Someone correct me if I'm wrong!)
I've never tried to arrive as early as 8:30 but I've been let in a little early for a 9:05 as they recommend checking in 10-15 minutes prior to the reservation. Can't guarantee every cast member will work the same way but I'd think for 9:05 you may be able to get in.
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