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Speakers just a reminder: you can ask for a CoC when you are accepted/invited to speak. It's an effective way to get one put in place.
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100% agree that CoC is insufficient, but it's a start. And the best way to get one is for people with more power to start demanding it.
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My tactic: reply to invitations saying "please confirm you have a CoC" if I can't find one, to emphasize how NORMAL and REASONABLE this is.