Ahotu race calendar website has a barefoot tag in search engine

I was on the Ahotu race calendar website that I know many use here in this part of the world use ... and noticed that they have "barefoot" as tag for the race. Not many races come up with the "barefoot" tag and I sent an e-mail to the site to see how they determine it is a "barefoot" race - I assume the race organization or a runner has indicated to Ahotu that it is a barefoot friendly race?
http://marathons.ahotu.com/calendar/marathon/barefoot
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It would be interesting to see how they determine a barefoot race ... and more interesting to me would be if this (or another) race search engine emerged that would include information on road surface of the race, so barefoot runners could properly prepare for an unknown race ... or at least to help those on the front end of barefoot running where smooth concrete or craggy asphalt would determine a DNF or not :)
 

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