I believe the last time for FP's on party nights is the 5:30-6:30 window since there's no FP's during party hours. So you should be fine making it to your 6:30 window..there's also usually a 15 min after grace window
I imagine guest services might be a little crowded, but being that party guests can start to enter at 4pm, I don't think it should be too bad
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