I'm one of the committee of
EightSquaredCon, the 2013 UK Eastercon; we described our
Code of Conduct in a blog post a few weeks ago.
A new event,
Nine Worlds, has recently been announced for August in London. Its website sets out a very clear and overt
anti-harassment policy.
LonCon 3, the 2014 Worldcon, does not yet have a detailed policy but has said that it will not tolerate harassment and
will make a more detailed statement closer to the event.