Warner Bros. Discovery’s lunch at the Food Network Kitchen after its upfront pitch to advertisers has become “an annual ritual,” in the words of Chief Revenue and Strategy Officer Bruce Campbell. This year’s edition, however, unfolded in the shadow of the pending $110 billion acquisition of WBD by David Ellison’s Paramount Skydance. The industry-altering deal, which is due to close by September 30 barring an 11th-hour legal challenge, gave the event an undeniably valedictory feel. “Welcome to the Last Supper,” one waggish WBD staffer joked as guests arrived. M&A deals are due to put assets like the Turner networks, HBO and Warner Bros. in the hands of a fourth corporate parent in eight years, earned a couple of mentions (direct or otherwise) during the company’s presentation.…