Share your event already on Facebook! If you have already made a Facebook event, you can enter its Facebook ID (found in the url) and automatically generate a news item.
To determine your event's Facebook ID, visit it on facebook. Looking at the url in the address bar, you should see a url similiar to http://www.facebook.com/event.php?eid=123456789. In this example 123456789 would be the Facebook ID of your event.