Hey Ulf,
Thanks for reaching out to us!
I definitely understand the need for what you’re describing, however we don’t have anything built into the plugin that will currently allow this type of control. To get what you’re needing, you can use a capability management plugin such as https://wordpress.org/plugins/capability-manager-enhanced/ that will allow you to more granularly control what the different roles on your site have the capability to do. With this, you can give roles other than the administrator the ability to add/edit events.
Let me know if this helps.
Thanks!