If you want to subscribe to an iCal calendar using Google calendar, here’s how you do it.
First, go to your calendars so that you see ‘Other Calendars’ appear at the bottom of the screen. Click the down arrow next to it:
From the menu that appears, click ‘Add by URL’
The following dialog box will open, asking for the URL of your iCal feed.
Note that Google does not handle URLs that begin with
webcals:// at all. If you have an iCal URL that begins with one of these, change it as follows:
Paste your iCal URL inot the box and hit ‘Add Calendar’. The calendar will then appear in your calendar screen.