The ability to view the calendars for the various resources at the school needs to be turned on the Calendar web interface. Here is a link to how to turn them on. Once those calendars have been subscribed, you can then view them in iCal. Here's how...
Open iCal preferences (Command + ","). Click on Accounts icon on the top icon bar. Then click on the Gmail CalDAV account in the sidebar. Then click on the "Delegation" tab in the area on the right of the sidebar. You will see a list of the calendars to which you have subscribed via the web interface. Check the boxes next to the calendars you want to show up in iCal. |
When you are finished viewing the calendars, you can uncheck them so they don't clutter up your view in iCal.