The other way to do it is to find an established, yet small, convention somewhere and contact them about hosting an Aliens cast reunion. They already have the place, the attendees, the staff, and the dealers, add in someone with access to the Aliens actors and fans, and they would beg for that kind of help.
Of course, if someone does use this tactic, that TIE Pilot #3 Fan Film guy should get a free room and free airfare!
-Spat
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