This Week in the Holiday Markets Check out this incredible array of artisan and food markets going on this weekend. Some are open all season long, and some are one or tw0 day events across the city. For the full listing of almost 60 holiday markets, check out the complete 2012 Holiday Markets of New York City Guide! Season-Long Markets September 19 – December 31.  Artists and Fleas Fall/Holiday Pop Up at Chelsea Market, 9th and 15th Sts, Manhattan October 26 – January 11.  Ho