Importing Facebook events into Calendar on Mac
I can export my upcoming events to iCal in Facebook. These are the steps that I follow:


Open up https://www.facebook.com/events/calendar 
Click on the cog-wheel icon in the upper right corner (shown in the image below)

Click Export. A Facebook prompt window will appear with the following text:


  You can export your friends' birthdays or upcoming events into Apple iCal, Microsoft Outlook and Google Calendar.

Click on upcoming events. Now iCal will open with a window where you can insert a calendar URL to which you want to subscribe. Leave the filled in text field as is and click on Subscribe. 
Now you will have all your upcoming events in iCal.