iCal Feed Instructions
iCalendar (*.ics extension) is a popular file format used to distribute calendar information between different applications over the internet.
Apple iCal Instructions
To subscribe to an iCalendar feed using Apple's iCal program:
- Open the iCal program (in Applications)
- From the Calendar menu select Subscribe
- Type or paste one of the two feed URLs above into Calendar URL field then click Subscribe
- Change the name and color (optional) and update the Auto-refresh frequency to Every day (important!), then click OK

- The events should now appear in your calendar
Google Calendar Instructions
To subscribe to an iCalendar feed using Google Calendar:
- In the left column, click on the Add link in the Other Calendars section.

- From the menu select Add by URL.
- Enter the feed URL in the dialog box then click Add Calendar.

- There appears to me no way to manually set how often the calendar is refreshed.