It seems Metropolitan Pier and Exposition Authority (AKA McPier) is struggling to keep high revenue-generating conventions in Chicago, with the Society of Plastics Industry and the Chicago-based Healthcare Information and Management Systems Society moving their conventions to less costly locations. Dennis Byrne at Chicago Now has an idea of who's to blame. Meanwhile McPier, which manages conventions and trade shows at McCormick Place and Navy Pier, isn't doing so well themselves.