Hi there!
Thanks for reaching out! Our team has been working with facebook to find a way to restore at least some of the functionality that was lost from Aggregator when facebook changed their API for accessing events. Unfortunately, things have been pretty slow going from the Facebook side of things.
For a temporary solution, you can export your events from Facebook, and manually import them using the Events import functionality. To learn about exporting events from facebook, check out this help page: https://www.facebook.com/help/work/897976446932009?helpref=hc_fnav
This should provide you with an ics file that can be imported into the Events Calendar.
Hope that helps! Please let me know if you have any other questions about this.
Thanks,
Sky