To add this to your Google calendar click the "+GoogleCalendar" on the bottom right hand corner of the calendar above. If you need help adding it to your Google calendar, or signing up for a Google account, here's a video to help you out: 

If you do not have a Google calendar, and don't want to get one, the links below may help you add it to other software or calendars.
Public URL:

iCal download (will not update automatically):