Anyway. By Diving in the code of the page you provided in the question, I found that the .ics file can be reached in this address: http://events.colorado.edu/eventexport.aspx?Eid=14255&Iid=72564&Dt=O&fmt=I&invite=False&inviteemail=
So if you are interested in adding the appointment of this .ics file (and may be other appointments when the file is updated), you can import the file directly by Clicking the button next to "Other calendars" (the one with a small triangle pointing to downside) and choose "Add by URL" as we can see in the next screenshot:
You will be asked for the url, let's introduce the .ics file url and hit the "Add Calendar". Google Calendar will import the file and add it to your current appointments list as we can see in the next screenshot.
BTW The last appointment for that calendar seems to be dated for Sunday June 30 @ 16:00-18:00 Hrs.