Howdy Fred,
This is certainly doable with our API. Of course utilizing the Events API does require a PHP background and understanding of the WP API.
It probably makes the most sense to add a separate page for community Facebook events, and like you said you could just have a simple form for submitting FB Event IDs. You can use Tribe_FB_Importer:: create_local_event() for processing the forms data.
If you have the know how this should be very easy. If not we could recommend some developers that know all of the APIs. Does that answer your question? Thanks for posting!
– Brook