Add only attendee to a calendar (not myself) or rather delegate event to user

Hi there,
scanning through event relevant posts, I could not find the answer to my question:

Can I delegate an event to a user?

The story behind it:
We are using a shared calendar with mutiple users. Each user is responsible for one event. Everybody can add, edit and delete events, but it is hard to tell, who added which event and (in our case) is therefore responsible. It seems impossible to add oneselve as attendee and as soon as I add somebody else (delegate) I get added myself as responsible. But I want the other person, who I add, to be responsible.

Does that make sense?

What would also help, would be an option to simply join an event, with no invitation whatsoever.
Users, who have access to the calendar could pick by themselves, if they attend or not.