The convergence of millions of fans in crowded venues increases the risk of disease transmission. Vulnerable populations, including children and the elderly, may face heightened risks from heat-related illnesses and infectious diseases. Measles, norovirus, and mosquito-borne illnesses like dengue fever are of particular concern. Wastewater testing has already detected rotavirus and hepatitis A in some areas, signaling potential outbreaks. Health agencies are stretched thin, with limited resources and ongoing challenges such as staffing shortages. Despite these risks, officials stress that proactive measures are in place to mitigate potential health crises.