Mass gatherings are events attended by a sufficient number of people to strain the planning and response resources of the host community, state/province/, nation, or region where it is being held. Definitions of a mass gathering generally include the following:

• Planned (long term or spontaneously planned) event
• “a specified number of persons (at least >1000 persons)
• at a specific location, for a specific purpose (e.g. social function, public event, sporting event) for a defined period of time”.
• Requires Multi-Agency Coordination

Mass Gathering Medicine  is a new field of medicine

Medicine

Medicine is the science and art of healing. It encompasses a variety of health care practices evolved to maintain and restore health by the prevention and treatment of illness....

 that focuses on the health risks of mass gatherings. The World Health Organization

World Health Organization

The World Health Organization is a specialized agency of the United Nations that acts as a coordinating authority on international public health. Established on 7 April 1948, with headquarters in Geneva, Switzerland, the agency inherited the mandate and resources of its predecessor, the Health...

 through its department of the Department of Global Alert and Response supports Member States hosting mass gatherings and regularly receives a large number of requests for technical support

Technical support

Technical support or tech support refers to a range of services by which enterprises provide assistance to users of technology products such as mobile phones, televisions, computers, software products or other electronic or mechanical goods...

by countries organizing large mass gatherings.