Hi there!
Thanks for getting in touch! I’m afraid that our Facebook Events add-on largely operates in a one-way capacity; currently there isn’t any way way to automatically mirror events created in The Events Calendar as Facebook events. You can read more about how importing and syncing works with Facebook Events on our Knowledgebase here.
That said, you might consider looking into one of the many third-party social media sharing plugins that are available for WordPress–one of these might be useful if you’d just like to share links to your calendar events that users can click from Facebook!
I hope that helps–let me know if you should have any other questions!