Oh jeez, Nutloose, you crack me up.
How many Airshows have you organised?
What is your experience of organising a major airshow?
I did the Finningley show for 8 years: it is a dynamic process. You get some young, enthusiastic PRO and your planned 40K attendance, coupled with the weather suddenly becomes 160K.
Oh, and did I forget....you are at the mercy of the weather!