The following are the steps needed to add onCampus calendars to Google Calendar.

From the onCampus Calendar page, click on the RSS feed icon. 

The window that opens has information about how to subscribe to calendar feeds. Note that "Events for the past 2 months an the upcoming 12 months will be included in the feed. It may take up to an hour for any setting changes to be reflected in your external calendars."

Find the calendar you want to subscribe to, right click on the link, and choose Copy Link Address.

In Google Calendar, go to Other Calendars and click the "+" sign to add a calendar.

Choose From URL.

Paste the calendar link address and click Add calendar.

The calendar should now show in Google Calendar under "Other calendars". 

To change the name of the calendar, click the 3 dots for the calendar. 

Choose Settings

Edit the Name field.