How To Automatically Sync Your Facebook Events With iCal on Your Mac, iCloud for Your iPhone, and Google Calendar
Visit your Facebook Events page and find the "Export Events" link under the filter menu in the upper right. Click the link to the iCalendar format, and it will open up in iCal automatically.
First, add your contacts to the web-based calendar. Then after you've connected your Google Account to your mac, open your iCal preferences and choose the "Delegates" tab of your Google CalDAV account.