You are quite right, and someone asked about this during the Q&A. I would love to help with that problem. I decided to address the lack of women because I have great contacts in that area. My contacts aren't as good among communities that I'm not personally a part of.
But, now that we've been open about our goal to increase women's participation, we've made some contacts with members of other communities. We're now planning a workshop (for all genders) in Spanish, which we hope will draw in some of the Hispanic developers in SF.