I suppose I'd like to see some sort of opportunity to speak with owners of similar types, and suppliers who can help me.
I like Popham's approach - a themed day but all invited
One thing I hate is where you have to book a slot time in advance. Given wx problems this year there is no way I could have even tried to guess the time of arrival or departure on the day, let alone days in advance
So if you are ruling out a display - that's fine with me, but there should also not be a time band, as happened at Kemble this year, where departures and arrivals were suspended for 'events'.