In our previous article, we have written about the importance of synching your digital calendars. You can find the article here: Digital calendars are made to be synched!.
You can add Facebook events into your calendar, but it has to be done from a computer browser (not mobile browser or app) and it has to be done individually for each event.
Keep in mind that this is only a copy of the information, so any changes or cancellations will not be updated in your calendar.
This is how you do it: