[Shanj]

Me too.

But I want a 3 level hierarchy calendar.

I want a GENERAL top level calendar as is, all calendars feed from this one so these are shared community interest.

Second level is USERGROUP based so admin (or mods) can set events relevant to usergroup.
At this level you view all the top level events PLUS your usergroup events.

[ If a high quality mod, then admin option to allow users who have access, or perhaps selected users among these, to post to this group calendar.]

Third level is USER calendar.
At this level you view all the top level events, all the usergroup events.
You can add your own commitments and reminders.

[If a high quality mod, then admin option to allow users to delete.
You can soft delete higher level events (in case you need them later) marked by icon.
You can optionally soft delete or hard delete your own events.]