A ZeroMQ community leader has had a couple of interesting things to say about Codes of Conduct on his blog. http://hintjens.com/blog:108

He's been pondering on how to make a Code of Conduct that will be effective at ending harassment at tech conferences.  It rephrases the discussion to say that large gatherings tend to attract some bad actors, and we need to be able to defend ourselves against bad actors.  Perhaps this is a more palatable way of phrasing things: it doesn't sound like every participant is being accused of being a potential violator.

But I'll let you read his post.  I won't try to summarize it all.