My grandfather was First Fandom, which means he was one of the first people in the world to organize a science fiction fan club, the Science Fiction Club in Oakland, CA in 1928.
He took me to a lot of science fiction conventions when I was little. There has been all sorts of untoward behavior in the fan community but for me, as a little kid with a big afro, I was always treated kindly by Andorians, Vulcans, and Romulans alike.
SF Conventions and fandom in general was a lot different before comic book movies took over the box office, transforming ComicCon and everything else.
Trekkies gets across what I remember of the old vibe really well, and it’s still the best doc on a fan community. Here’s an article on why – via io9
So what does Trekkies teach about making a good fan documentary? Love your subject, but don’t try to force your audience to love it too. The moment that sums up Trekkies is an early scene of Adams explaining why she sat on the Whitewater jury in costume: “I don’t want my officers to ever feel ashamed to wear their uniform.” It’s a ridiculous statement: it’s not a real uniform, for Pete’s sake. But it’s touching that Adams feels a responsibility to make other fans feel comfortable and confident, that she wants to live the utopian ethics of Star Trek.