Last Saturday afternoon, February 23, a few hundred people visited the top floor of the Culinary Institute of America at Greystone in Napa County.  A few hours later they left, but not until they had purchased some Napa wine.  $3.7 million worth of Napa wine.   "Premiere Napa Valley" is the annual auction of one-of-a-kind Napa wine selections in lots as small as 60 bottles and no larger than ...