If MK is opening up at 9AM the day of your PS, the don't open the turnstiles until 8AM. Sometimes a few minutes before, and sometimes a few minutes after. We once had a PS at Cindy's for 8:10, and the turnstiles didn't open until 8:05!!! We got in as soon as we could and made it to the castle by 8:20, we were seated immediately. I asked a CM about it, and he said that the CM's at the restaurants know when the turnstiles are opened, so if they open late, they're aware and will expect late arrivals. If it's an EMH morning at MK, the turnstiles might open up 15 minutes before, but you'll only be allowed just inside, for the rope drop. Unforunately, the days of opening up Main Street early for people to wander down alone, is pretty much over. Plan on arriving at Mk early to be up near the front of the turnstiles, but you won't be able to get in before 8 AM.