You are possibly getting slightly confused because both organisations describe themselves as 'Clubs'. Actually, they are more or less just commercial enterprises that call their 'punters' members as it sounds better. You do however get voting rights at the AGM, but as these are usually pre decided Motions, it does not mean a lot.
They both offer excellent campsites but that is really as far as it goes. Evening entertainment is not normally on the agenda and you have to understand the wardens do need some private time as well.
As mentioned, join some of the Rallys where other activities are available, or again as mentioned, some commercial sites offer social clubs, but this is often a reason why people don't go and stay with the 2 main Clubs. Drunks falling out at midnight can put a damper on anyone trying to sleep.
You could also go to sites with friends, and make your own entertainment as a group. Unfortunately, television has killed much of the social intercourse that used to be part and parcel of camping. My wife bemoans the fact that people no longer sit outside under the awning in an evening drinking coffee and chatting, but prefer the latest shenanigans in Neighbours or some other such programme locked away inside their vans.
Sorry, we are getting to be a very antisocial lot in the UK, and we prefer to go to Europe where we cannot watch TV, and people are often more chatty. Also by 9 pm I am usually so pooped that bed is a welcome.