Can I sync Facebook events with BusyCal?

Facebook provides calendar feeds for Upcoming Events and Birthdays, which you can subscribe to in BusyCal, as follows.

Go to this page in a browser:

https://www.facebook.com/events/upcoming

On the bottom of the sidebar on the right, you'll find two links -- one for Upcoming Events and another for Birthdays. Control-click on one of these links and choose Copy Link.

In BusyCal, select File > New Calendar Subscription, then paste the URL into the Calendar URL field and click Subscribe.