I belong to a local car club and I drag the members along each year to one of the Evening events. As they are CAR enthusiasts they tend to go for the flying with a "wow" factor which means the exteme aerobatics and the Spitfire. The Boxkite always gets a thumbs-up as well.
I agree with other comments that you need to co-ordinate with Duxford and Little Gransden on show dates. There is a limit to an enthusiasts budget and entrance fees never go down.