On the left, click the drop-down arrow next to “Other calendars” and select “Add by URL”
Step 5
Just paste in your iCal feed URL and hit “Add Calendar”
When it finished, you will have a calendar named with that weird URL. You don’t want that. To change its name, hover your mouse over the calendar on the left and click the arrow then select “Calendar settings.” In the new page, you can change its name
According to Google, it may take up to 12 hours before it completes syncing the calendar feed