I have a group of users in a professional area who want to share a calendar for their work function.
What's the best way to do it?

At the moment, each has their own personal appointment area and can book meetings for themselves. They are able to see each other's calendars and book meetings using the schedule function, and they can open each other's calendars if they want to.

I'm looking to create an independent 'group' calendar that can collate their combined activity - but how do I do it without simply asking them for double entry?

Initially I thought of setting up a resource calendar that they always invited to meetings - but, presumably, it will reject conflicts.

Any ideas?