How to subscribe to events
This usually works (if you have a Google account)
Click the calendar's "Online view w/ subscribe link". That goes to a web view of the calendar where you can see the events. At the bottom left is a small link labeled "Add to Google Calendar":
Click that link. You'll go to your Google calendar, and our calendar should be included in "Other calendars". New events should automatically import into your calendar when we create them.
This sometimes works (even without a Google account)
Click on the calendar's "ical event list". On a phone, that should open your calendar app and offer to import all the events into your calendar. You might also get the option to add the calendar so that new events are automatically imported too. On a computer, you might have to look in your downloads for a file called basic.ics, and open that with your calendar software.
This always works
Right-click the calendar's "ical event list" and copy the link. Go to your calendar software, and paste that link into the "add calendar from URL" feature. On Google that looks like this: