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You want it on your Google Calendar itself on Google servers or just on your phone so you can get alerts? If it's just on your phone, just enable calendar sync from the FB app and it will appear in your calendar app and alert you just like any normal entry in the calendar app.
On my phone, Android 4.1.2, stock Samsung ROM: settings>accounts>Facebook>tap on your name>sync calendar
What version is your FB app?
Well that's weird. The latest version available for me is 7.something. What device do you have again? And what Android version?