It's not a freedom of speech issue - it's just about avoiding doing things that detract from other people's experience of the event/the industry/etc. If someon

It's not a freedom of speech issue - it's just about avoiding doing things that detract from other people's experience of the event/the industry/etc. If someone had come to the conference and broadcast music that was far, far too loud and which obviously impeded people's experience of the conference, nobody would be defending them. What these guys are doing isn't a lot different. The kids angle is fairly important - I got a lot of value from hanging out at os2 and linux user groups when I was young. Professional orgs and conferences can be an escape from the heavily stratified world kids are stuck in for most of their lives, and help people develop interests early.