This is a cool idea! Makes me want to form one in Southern California.
What a coincidence!
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http://spelunk.in/2013/06/04/satoshi-square-la-june-12It was a fantastic event! There was about 30 people at one point and total attended could have been even higher if some had left early or arrived later.
There wasn't a huge amount of trading ... but the buyers were paying over spot.
And there was a special guest appearance too!