Looking for multiple admins calendar

Hey there!

I am in desperate search for a plugin that will allow this:

I need a calendar with categories, where each category is administered by a specific admin-user.
These specific calendar admins must ONLY be able to administer their OWN category.

Each category should displayable to all (including non-logged-in users). Each category has its own calendar page.

A “Full calendar” page containg all events from all categories is also neccesary.

Do you know of any plugins that will do this? (Does not have to be free)

OR

Maybe secondary a calendar that will allow multiple installs, and where one of the installs can be a feed from all installed calendars?
So that it isnt categories but separate calendars – and the full calendar is a calendar containing a feed from the the separate calendars.

Any ideas?

Please? – I have tried out a bunch of different calendar plugins, – but not found one that will actually do this, yet….

Thx
John