By the way, what is this anti-harrasment-policy ? Was there any harrasment in previous bitcoin workshops ?
I don't know of any specific harassment at Bitcoin workshops --
Andreas asks for this at anything he agrees to speak at.
From what I understand it has been a problem in the past in certain other tech / open source events. Andreas has taken a lead on this to make sure the problem doesn't become a common occurrence in Bitcoin. I think by him mentioning it a couple times and asking for this policy, it does a great thing to increase awareness and set expectations. It's a great way for him to use his influence. To be honest it would have never occurred to me to have the policy if Andreas hadn't asked for it, I think it's great. I would never want to see anyone have a negative expeirience.