My guess as to why the rule about no dancing during card assemblies was in operation in Ramsgate is that Mr Le Bas, the Master of Cermnoies at Ramsgate was also the Master of Cermonies at Margate.

The assembly room there, if we can judge form its Rules and Orders for Admissions, was a much larger set of rooms, used to a large company. It held balls on Mondays and Thursdays ( Ramsgate held them on Tuesdays) and I think the rule re no dancing on other nights was enforced because Mr Le Bas was not present all the time at Ramsgate: it would appear that he was based in Margate,and therefore would not be able to oversee the assembly rooms at Ramsgate exclusively but had duties to perform on other nights at Margate.