"By the time a man attends a trade conference, it's at least a decade too late."
Nonsense, and believing this serves only to exclude people who could otherwise be beneficial members of the community. There's no black and white distinction between people who behave appropriately and who behave inappropriately. There's plenty of situations in my life where I've behaved inappropriately towards women, and some of them occurred after I'd started attending trade shows. The point isn't how people are brought up. It's how they behave after it's been pointed out that their behaviour isn't acceptable, and whether they're willing to accept that they're wrong and modify their behaviour in future.
The role of codes of conduct is to allow the organisers to provide a relevant and proportional response without putting the victim in a position of responsibility, not to immediately eject anyone who says something wrong. It's certainly not MAN PROTECT WOMAN WITH POWER OF MIGHTY ARM MUSCLES, and turning it purely into a man against woman problem just perpetuates the concept of gender roles.