Agree with most of the above (especially no slots or hi-viz vests!) but no-one's so far mentioned fuel availability. At bigger venues probably a given, but at smaller or unusual venues can be a problem. I'm not talking about supplying tourers with large uplifts, but the puddle-jumpers like VPs, Lutons etc (or even Aeroncas
) whose range is limited and for whom a few litres can make all the difference.
Slip
PS 'DK: I'm also intrigued as to which fly-in you are referring to.....