If you recognize all of these interview subjects, you're bona fide.
Extreme fandom of any sort is usually pretty interesting and seeing people create for themselves is inspirational.
The DVD can be ordered HERE for $15.
Here's the YouTube blurb:
This feature-length documentary film tells the story of the 1970's Bay Area Sci-Fi conventions called Space-Con. Told by the original organizers and fans. Includes celebrity interviews, costume contests and over 40 minutes of rare convention footage. See the Federation Trading Post in Berkeley and very first Star Trek convention in San Francisco. A real treat for any Star Trek or Star Wars fan. Film stars Bob Wilkins, John Stanley, Ernie Fosselius, and many more.