Inside a giant tent at New York’s Lincoln Center in May, Phil Robertson strolls onstage. He’s wearing camouflage pants, wraparound sunglasses, and a solid-black long-sleeve shirt that accentuates his signature beard, which is off-white, unruly, and of ZZ Top proportions. Before him are a multitude of linen-draped tables, where media buyers from advertising companies sip wine, nibble on plantain chips, and listen to yet another pitch on how they should spend their clients’ budgets. This is advertising “upfront” season in New York, and Robertson, a cast member on A+E Networks’ runaway blockbuster reality program Duck Dynasty, is one of the stars of tonight’s show.