[Doc Faustus]

Make sure to do it well in advance. It will take awhile to get in touch with some people. And don't shoot too high if this is your first time doing the event. Big name celebrities won't often show up at the first year of a convention because you can't necessarily promise a lot of attendees. Also, celebrities that are pleased with your convention will spread the word that it was a good experience and a lucrative thing to do.