The document provides information on the various unions that may need to be used when exhibiting at trade shows in Chicago, including electricians, plumbers, riggers, material handlers, carpenters, and decorators. It describes the services each union provides and tips for working with them, such as providing layout plans, pre-wiring equipment, and marking machinery locations, to save on costs and streamline the setup process. Contact information is also included for Dimension Craft Inc. for any additional exhibition needs.