Add facebook events permanently to your Google Calendar

I'm always in Google Calendar, never in Facebook events. But I want to keep track, so I've added my Facebook events calendar to my Google Calendar.

1. In Facebook, go to your EVENTS page.
2. At the top of that page click EXPORT EVENT
3. You'll get a pop up window with a URL, copy it.
4. In Google Cal, on the bottom left you'll see ‘Other Calendars' and below that a link to ADD. Click ADD
5. One of the new options you'll be presented with is ADD BY URL, select that
6. Paste the URL from Facebook where it asks for it.
   Source: lifehacker.com