google calender 3

Many librarians also take the extra step of controlling access to the schedule.  In other words staff can view the calender but cannot modify it on their own and must email staff to get put on it.

Some use google forms in combination with a google doc or spreadsheet for teachers to fill out initially or as a interface for the schedule.

Thanks a bunch for the replies especially Joleen Pillars of the Gilbert School which I found really helpful.  

Any additional thought or ideas would be welcome.