Yapla allows you to easily set up pages restricted to members or certain categories of members. Thus, the articles and other items hosted on these pages will only be visible to people who are logged in. You can even refine your control by allowing only certain groups to see this page.
To learn more about this, please read this article: limiting access to a page to logged-in people
For events and activities, you can limit the visibility of specific rates to logged-in people or to certain groups of logged-in people.
To learn more about this, please consult this procedure: Rate management
Another possibility is to restrict access your event or activity to people with an invitation (a password to access the event registration).
To learn more, please consult this article: Registration process configuration