The gist is that someone rents a track for a fee, say $6,000 for the day. Then the organizer charges $250 per person for the track day. Quite a few groups do it and you should be able to do it at laguna or sears point. If not, buttonwillow does them for sure.
I would send you a link from other threads, but I'm on iPhone and it doesn't copy and paste.
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