RTFI !
Having not gone to the Aero Expo having decided to get involved with another form of mechanical entertainment on the Isle of Man I can't comment on the goings on at Aero expo but as said above the problems seem to come from two sources.
Those who don't read or fail to understand the issued instructions ( just like the guy at the PFA rally who was trying to talk to the ATIS recorded message)
Those who are unable to fly a variable approach speed, you need to be happy with anything between 65 & 80KTS for the Initial approach to enable you to space yourself from the aircraft ahead and be of the attitude that a go-around is the likely outcome of any approach at this sort of event.