PZ asks: Why not more people at secular conventions?

I hear that the big American Atheists conference in Austin had an attendance of about 900 [...] 

But…perspective. I’m at a middling-to-good-sized [science fiction] convention, which is one of the larger regional events. 

Attendance, I’m told, was about 3000 people. Costs for the two events were roughly comparable to attendees. There’s absolutely no comparison with the big national events like Comic-con and Dragon*Con. 

I’m sorry, but I think secularism, humanism, and atheism are of greater relevance to people than comic-books. What can we do to grow our audience?

1. There is a particular audience that thinks cosplay is more interesting than panels about 'misogyny' in some online forum they've never heard of. Go figure.
2. It seems documenting every negative interaction you have at a secular conference on your blog has a negative effect on attendance numbers.
3. Turns out that "we have a harassment policy" is not a winner of a tag line.
4. When SkepChicks support DragonCon so much they can't bring themselves to immediately cease supporting a child abuser, we may have a problem.
5. Skepchick has always embedded its alcohol-fueled love fest in sci-fi convention CONvergence, which is really a terrible statement in regards to the status of typical 'skeptic' conventions.