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How do you achieve the diversity part?
I invite a diverse set of speakers, rather than waiting for them to apply. I chose everyone for the marginal benefit they bring to the programme. A common criticism of CfPs is that minority groups are less likely to apply, but (whether that's true or not) I don't use them.
How single person can feel that he is unbiased is enigma to me. But that's ok. Bottom line: it's your conference Jon, your choice of speakers, people who knew you for many years, you call the shots not to open CfP. That's ALL RIGHT. Let's just not pretend it's a community thing.
I don't really believe I'm unbiased: I am biased. But I do go to almost every Scala conference, and I put in many hours into meeting potential speakers throughout the year to curate the programme. They're not all people I've known for many years, but I do know most.
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