In the userinfo of the comm, make sure you put down anything related to the comm in the interest section. For qaf for example, you can put qaf, hal sparks, brian (whatever last name), showtime, all words you can think of related to the show. It will help people find the community. You can also promote it at

http://dw-community-promo.dreamwidth.org/
http://community-promo.dreamwidth.org/