There's a review of a Kosher Kitchensurfing event here http://www.collive.com/show_news.rtx?id=32566&alias=cured-branzini-on-eastern-parkway
It would appear that at this particular event they had a mashgiach from OK.
Given the highly customizable approach, I would guess that Kashrus and supervision probably negotiable between the private chef and the customer.
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