Sara Fischer, author of Axios Media TrendsThe Live Nation Entertainment logo is displayed on a smartphone screen. Photo Illustration: Rafael Henrique/SOPA Images/LightRocket via Getty ImagesThe Department of Justice and a group of U.S. state attorneys general on Thursday plan to sue ticketing giant Live Nation for antitrust, a source familiar with the DOJ's plans told Axios. Why it matters: The outcome of the legal battle with one of the largest ticketing and live events companies in the U.S. c...