For a relationship or just a chit-chat?
If the latter, I think you shouldn't bother about gender, talk on related forums, go to conventions. You'll eventually come across some girls/women if you're persistent doing these activities.
If the former, kind of the same logic but priorities switched: if you look for enough girls on Tinder or somewhere like that, maybe you'll find someone who's also into this, or will be just simply curious for the topic.
There's just no magic bait