Overall, 22,312 attendees were at the 2011 NACS Show in Chicago, a 1.5% increase over last year’s attendance. Retailer registration and housing opens, today, on Monday, April 2, for the NACS Show. This year’s NACS Show will take place Oct. 7-10 in Las Vegas. NACS Show retailer attendees, as well as wholesalers and distributors, can…