"On the day, you will have the opportunity to walk through the Stadium with family and friends and enjoy 360-degree access across two levels. This will be your first chance to try out all the amazing ‘fans first’ features..This is your first opportunity to sit in the seats, try out the cup holders and take in the magnificent views of the playing surface, the city, the Swan River and the foothills. From the seats you will also be able to see where your favourite team will run out from, and so much more!."
The Club has been advising that come the Open Day you will have the opportunity to sit in your seats. From what I can infer from the text above taken from the Perth Stadium Website, this may not be the case for all members.