Glenn,
Will think some more on this and report back if I come up with
something brilliant.
There's this suggestion, which includes the idea of a merged calendar which aggregates events from the primary and subgroups. That might solve a couple of the problems with using a subgroup calendar.
There are also some years-old wishes in the beta group for the ability to moderate member contributions/edits to the web features (calendar, database, files, photos, wiki). And for more granular access control generally.
Perhaps what you're looking for fits in with some of those ideas.
Shal
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