1. If you go to your facebook events page (
Welcome to Facebook | Facebook), there's a link at the very bottom titled "export events".
2. Clicking this will give you a window with another link. If you click this, it'll download a .ics file. But you don't want to download it.
3. Instead, right click it and copy the link.
4. In google calendar, select the "add" option at the bottom of the other calendars pane.
5. Select "add by URL" and paste that link in there. It should import your calendar and even update it as new events are added.
I think that's what I did to get my calendar on google calendars. The only downside is that your phone will name the calendar whatever the URL was for some reason.