Brainstorming on a large scale in the Windy City At a Chicago crowdsourcing event, scores of marketers and PR pros join forces to strategize. By Jessica Levco@raganreporterNov. 20, 2009 SHARE To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.