Create Sharepoint calendar from an Event List with filtered events

Hi,

We have an app that outputs an Event list: GlobalEventList. To that event list, all users need to have write permissions in order for the app to create or delete events in the respective user context.

I can limit access to the sharepoint site, so general access to that event list is not considered a problem.

I now want a specific user to see a calendar with only a filtered set of events (e.g. a calendar with all events where DepartmentName = "DE" (where DepartmentName is a custom field added by the App)). That specific user shall not see all other events from the event list. So creating a view does not do the trick.

So I was hoping to create a new Calendar for each filtered set of events, for which I set the permissions accordingly and that copies the events from the GlobalEventsList according to a filter.

Any suggestions on how to do this?

Regards
Julian