TOPIC: FrontEnd event management

Hi all,
I have been trying to get support through the ticketing system for a few days without luck..
I have setup different user levels in Joomlaand wanted to allow my instructors to manage events.
When I set-up an event on the backend and assign it to a specific user it should be possible for this user (instructor) to be able to edit this event.
I there a way for me to only allow the instructors to edit the events that have them as owners?
If tick "EDIT OWN ITEMS ONLY" i get "you are not allowed to..." message.
If I uptick it they could see and edit ALL the events I have ever set-up..
Any suggestions?
Thank you
Erez