Look a the bottom of the page for information on embedding the Calendar on your device or online Google Calendar. If you use a Google calendar, you should be able to press the plus sign on the bottom right of the embedded calendar to add the calendar to your calendar.

Use this link to access the calendar on a computer. Click here Android, make sure you go into settings and set calendar to sync or it will not sync correctly to your phone or calendar.

Use this to access or integrate the calendar in iCal format (i.e. iPhone)
IPhone/Apple - make sure you import the ics file into your Apple Calendar.