The event takes place at the Vulcan Arena in May and organiser Nick Andrew is trying to get some intergalactic visitors to attend.
If the inaugural event is a success, Mr Andrew hopes to make it a regular fixture.
"It would be nice to put on this sort of event a couple of times per year," he said.
And he wants people who are interested in movie memorabilia, collectable toys or model trains, and would like to run a stall, to get in touch.
Mr Andrew is also keen to hear from anyone who can supply a large number of trestle tables for the event.
Anyone who is interested in running a stall or donating tables should call Nick, or e-mail:
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