Events + & membership 2 - event category pages do not show content

I am using the events + plugin in combination with the membership 2 plugin. (Both current versions).
I have set event categories and added single events to specific categories - so I can see a list of all events of the same type.
If I open the category page as an administrator - everything is fine and I see the list of events.
But if I am switching users to subscriber, editor, author - I receive the note that there is no content to be shown. If I open the link to the event page wit the same user - the event is shown.
Am I missing a checkmark somewhere?
Many thanks,