First-hand experience with the extreme heat and humidity of the 2007 Chicago Marathon, resulting in the need to cancel the event mid-race, gave George Chiampas, DO, CAQSM, FACEP, unique knowledge in the management of a mass-gathering event in the face of adversity. Today, the Chicago Marathon—which utilizes the emergency plan called the Chicago Model that Chiampas helped establish—is recognized as a world leader in emergency preparedness and public safety. In this episode, Chiampas shares strategies for enhancing preparedness for medical emergencies at mass-gathering sporting events, from high school football games to big city marathons.