iCal Subscription Help
When you first click a link to subscribe to an iCal calendar, your browser may alert you that it needs to launch the iCal* application, which you should allow.
Once iCal opens, a little window will pop open where you can choose how often you want iCal to check for updates to the calendar (we suggest once a week since these calendars are set for the year and changed infrequently).

You can also uncheck the "Remove Alarms" and "Remove To Do items" boxes as these calendars contain neither. Click the OK button once you've made these changes, and the calendar will now appear in your Calendar list in iCal with a small gray arrow to the right, indicating that you are subscribed to that calendar.
Repeat this process for all of the calendar categories you wish to subscribe to.
*In order to subscribe to the district iCal calendars, you must be using Apple iCal, or another application that reads vCal files.