We had an 8:10 PS and didnt get to the restaurant until at least 8:20. We were there bright and early but by the time they let us in, got us in groups, led us through the park and shouted all the orders at us, it was already later than we would have liked. After arriving we headed to the buffet(like we were told) but then shouted for because the characters were at our table. So by the time we started eating we were pretty stressed as we wanted to be to the safari by 9:00. Even with the running late, and making a few trips to the buffet(and a potty break), we got out of there right at 9:00(We skipped the picture, because we were so stressed in that meal we couldnt wait to leave.)
So, I think if you get the first PS(8:10) and things go a little more smoothly for you than they did for us, and you limit the trips to the buffet, you could possibly get to see the opening ceremonies. It may take some sprinting through the park, but I would think it could be done.