The Interactive Advertising Bureau says AdLarge, Midroll, NPR, Panoply, Podtrac, and WNYC will present at the first-ever "IAB Podcast Upfront Showcase." This one-day event on September 10 will preview for advertisers and media buyers the latest in podcast programming from each of those companies. The event will be held in Manhattan. The inaugural presenters are responsible for many of most popular podcasts, including "Associated Press News Digital-On-Demand," "Comedy Bang Bang," "Freakonomics Radio," "Happier," "Planet Money," "Radiolab," "RotoWire Fantasy Sports Podcasts," "Serial," "Slate's Political Gabfest," "TED Radio Hour," "This American Life," and "WTF with Marc Maron."