In the third hour of this Labor Day show, Dane Neal, filling for John Williams, was joined by “Dr. BBQ” Ray Lampe to talk about barbecuing on Labor Day and how to spice up old favorites for the holiday. Later, Iron Chefs Alex Guarnaschelli and Stephanie Izard joined Dane to discuss season two of “Alex Versus America” and the big return to restaurants, festivals, and food demos in Chicago.