Can't say for certain, but on .org a lot is made of people getting their registration in quickly and getting confirmation back. I think they issue 500. So I would suspect that registration is required for any of the 'official' events. But I would also think that evening social get togethers would not require registration.
Thanks for the link!
One more question though. The web page says registration is full. If I just show up will I be able to participate in anything?
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