1. Click Events in the left-hand menu.

2. Click the Calendar tab and click Synch with your own calendar.

   

3. Locate the desired event feed.

   

4. Highlight the URL and copy it. (Right-click on the highlighted URL and click Copy)
5. Open a browser window and log into your Google Calendar.
6. Click the arrow next to Other calendars.

   

7. Select Add by URL.
8. Paste the URL into the URL field and click Add Calendar.

Click here for information on unsubscribing from a calendar in Google Calendar.