Here is a "read only" planning calendar. You need to log in to this Google Calendar independently if you wish to add to or amend it, but if you already have a Google Calendar you can merge it with yours. Contact John Radford for details.
Click on an event to view details. If you use a Google Calendar you have the option of copying an individual event or (more useful) merging this calendar with your own. If your view of the calendar below is restricted, click here to see it full screen on a new page.