I think if you want an event to happen, it's important you recruit for it too to make it a success. Not just mention it and expect 77 to do all the legwork for you. I'm not sure if they do any advertisement outside of the coffee shop. I'm not faulting them though, they can do whatever they want. It is your responsibility though to create a word of mouth if you want to have a good time.
so, lesbians, if you get yours, tell your friends, tell your friends friends, post it on event sites and message boards and slip it into conversations with strangers. Learn from straights's mistakes's. take ownership of your event and make it big!