This is a local organisation in Ekerö and they want to protect and survive the memories and the history of this place. So, if you are interested in knowing when they have any event, check there web page. for 75 crones you can become amember and according to their brochure I found, they do have many activities.
Ekerö is a bit of a Garden of Stockholm and if you go to a Stockholm supermarket in Stockholm and look for vegetables or strawberries, you will often find they are from one of the islands. You too can go strawberry picking in summer - look for "självplock" signs along the road and pay for how much you pick.