Sorry I can't help you there. The site I linked claims to have forums and blogs if you join it so you might have more luck asking on their forum?
I doubt if many social gatherings distinguish themselves by marital status. They are mostly people with some sort of common interest. Some people who attend will be single some will be married. I know there is an active gardening club in the Chania area. There used to be a bridge club but I have no idea if it is still active. There is a photographic group over Apokoronas area. Cretan Corner
taverna near Aptera has coffee mornings on a regular basis, sometimes with a guest speaker or some other activity. There are a number of religious groups. I am sure that there must be many other such activities but I don't have any contact details. Probably other forum members who are involved with such groups will supply them.
Perhaps you might get more replies if you asked for info on gatherings of people interested in some specific topic that you are also interested in. It might also be useful if you added a location to your profile. It doesn't need to be precise, e.g. Chania area. I would imagine a coffee morning in Sitia wouldn't be of much interest to you and many people will not deduce your location from other posts you have made.