Major Agency and Buy-Side Leaders Confirm Participation in SHOWCASE: The World’s First Retail + Commerce Media Upfront

NEW YORK, August 20, 2026--Today, Ascendant Network announced that leaders from holdcos like Publicis Commerce, Dentsu, WPP, Omnicom, and IPG, along with independent agencies such as PMG and Tinuiti, will attend SHOWCASE: the world’s first retail + commerce media upfront, taking place on Wednesday, September 2, 2026, at The Times Center in New York City. At the inaugural event, the buy-side leaders will get an early look at the leading retail + commerce media network roadmaps and engage in strat