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Mass gathering medicine: a leisure or necessity?

What is mass gathering? No consensus is available on the definition of mass gathering. Some researchers define mass gatherings as an event which is attended by more than 1000 individuals, whereas others require the attendance of as many as 25,000 people (2,3). On the other hand, others considered mass gathering as any gathering of a large numbers of people attending an event that is focused at specific sites for a finite time (1). The largest peaceful mass gatherings in recent history are shown in Table 1. These definitions rely on the number of attendees as the basis for the definition. However, these definitions do not take into consideration the complexity of mass gathering or the surrounding circumstances. Thus, other authors proposed a definition that incorporates the potential for a delayed response to emergencies in an event of mass gathering, regardless of the number of attendees (4). Putting the definition in context of the ability to be prepared for disasters, thus calls for better planning and preparation to limit the hazards, and guarantee timely access to health care and other emergency facilities. Including this piece of information in the definition would allow the inclusion of other gathering, such as refugees and other camps designed for sheltering displaced population as a result of natural disasters, such as volcanos and hurricanes. Importance of situation and purpose of mass gathering