lets say you have a secretary that works for 3 lawyers.  You could drop 3 events modules onto a page and the secretary could add events to each of the lawyers calendars as necessary.

Then you can drop a 4th events module onto the page.  In the master settings for this module, select master and then add the other 3 events modules to the master.  This will aggregate the events from the first 3 modules and display them in the matser calendar like magic.

You could give the boss visibility to the master module so that he/she can see the schedules for each of his lawyers.

cheers