The Civic Society no longer exists and has instead been replaced by a new body called the Civic Voice. There is a large amount of information available on it's website which can be found by going to  

Another organisation who are very active and issue a considerable amount of information are The London Forum of Amenity and Civic Societies and they can be found at their information can be downloaded and I believe they will add you to their emailing list upon request.

Other useful links:-

Carshalton & District History & Archaeological Society

Carshalton Water Tower and Historic Garden Trust

Sutton Arts Council

The Friends of Nonsuch

Belmont and South Cheam Residents Association