Dear Aurora,
I am not sure that the number of women or the number of men defines the quality of a conference. It is the topics, the level of experience built in each topic, and naturally the experience of the presenters, whether they are men or women. I have seen both good men and good women in QM, the latter particularly in teaching. Conferences should be organized according to topics of research, independently of gender. Maybe this conference has topics that are mostly covered by one gender. That does however, not stop anyone from organizing another conference, where, occasionally, another gender is more overrepresented.