I don’t know about other sites but I give here you six steps to promote your event on Facebook.

1. Add social share buttons to your event registration page
2. Add a blurb to your Facebook Page banner
3. Promote your registration page on your fan Page wall
4. Create a Facebook Event
5. Offer live micro events on your fan Page
6. Encourage attendees to engage and share

If you want in depth info for this your can visit marismith.com/six-ways-effectively-promote-events-on-facebook-case-study/