I'll put my hand up, I'm a member of NDSOC also. I'm amused by this whole thing and may be it's all taken out of context. It's all about sharing ideas and having fun with like minded people regardless of club.
I think the first comment here may be out of context. The NDSOC were an invited club with the roadsters display and were allocated an area for club members, there may have been a misunderstanding by gate staff about that. The ndsoc had been pushing the event and who ever was involved may have thought the wrong thing.
Regardless, I have been a member of many clubs in and outside of cars, and the one most important thing is that a happy club is a successful club.
I have noticed on this forum that more than the average number of negative comments appear which may suggest a bit of insecurity, get over it. Do what you need to do and have fun, we'll all go along with that and join in.
My own special interest would be performance zeds, and if you incorporate as a club, which is the obvious thing to do, there is a real basis for sharing ideas and information. There's a lot of ex zed racers/ralliers out there with tons of knowledge.
And if you ask, I'm John, known to some of you. I'm not really into display days and will be at my son's go Kart titles on the 6th.