I think this is an excellent initiative by GitHub. It's well-acknowledged that there is a lack of women in tech, for what I'm sure is a wide variety of reasons

I think this is an excellent initiative by GitHub. It's well-acknowledged that there is a lack of women in tech, for what I'm sure is a wide variety of reasons, and celebrating the successes of women in that field is a noble endeavor. Personally I believe that these women are capable of being a role model to both men and women, as they presumably have achieved their successes through their own merits and not by virtue of their gender, so I'm sure the wisdom they have to share at these meetups would benefit everyone. To that end I would be disappointed to hear if, while the meetups may encourage or advertise to a female audience, they chose to exclude men.