Hi Mark!
Thanks for getting in touch with us! Let me help you with this topic.
Event Aggregator uses the Facebook API to fetch the events, so that should not be a problem. If you experience that some events in the future are not being fetched, then you might want to check the import limit settings by going to Events > Settings > Imports tab and adjust them to fit your needs.
Does it help you import the events you need? If you still experience issues with this, please share with us the Facebook URL where you are trying to import from and point us out to the events that are not getting imported.
Thanks,
Victor