"The Salt Lake City 2002 Winter Olympics and Paralympics were the largest mass gatherings to occur in the United States since the 1996 Summer Olympics in Atlanta. During the Olympics, a six county area in Utah experienced an average population increase of 100,000 people per day over a 17 day period. In addition, an estimated 3.5 billion people around the world watched some portion of the 2002 Olympics on television each day, bringing international press attention and creating a high profile potential platform for terrorist activity. Lessons learned from this event can provide valuable information for communities hosting other large-scale events including religious and political gatherings, music festivals, and sports competitions that challenge local public health capacity due to attendance, duration, health risks, and security concerns."
U.S. Dept. of Health and Human Services Best Practice Initiative