I think the 8.00 rule is going to be tricky... as pointed out folks can't guarantee they get there for that time (traffic, work, life...) so do they sit and wait until the evening to join the display (we are in living history) and we cater for about 15-20 people per day so need to go to the shops pretty much daily, doing a shop like that and being back by 8.00 is an early start...
Seems a bit draconian to me