If the public are there, then it's advisable as a base of safety, I.e. an easy way of being happy that the pilots are of a safe standard without seeing every one fly. The only thing I don't know how Stuart will get around this is that the event is aimed at all abilities, not just accomplished pilots. I guess it's something that Stuart can clarify though
The only criteria is to have insurance. Its informal in most points and we have a line that covers the whole flightline with pilots only allowed past the rope. The registration process for next year because we are looking to work with more regional bodies such as the tourism board and even more focused on public will be a full pilots regitration pack inc lanyard etc and badges. To ensure that those on the flight line have easy access, it won't stop people being able to simply turn up and register in.