This calendar is public and may be included in your Google, Outlook, Lotus, or other calendar. To add this calendar using the iCal URL copy the link found here. You can then paste the address in your web based or PC based application. Already use Google Calendar? Then click on the +Google Calendar icon in the bottom right of the widget to add the entire calendar. Or click on one event to ad an individual reminder of a single event.
The basics.ics file for this calendar is here, which is another format your calendar application may require.