[MrKurtHaeusler]

I agree that they are not sexist. However I don't think diversity needs to be an explicit goal of choosing a speaker lineup.

Having said that, being aware of the diversity in software development, if I were to organise a conference, and only managed to attract male speakers, I would think "oh shit, something has gone very wrong here", and I would not hesitate to cancel it and try and address the serious issue.