What's the definition?
The definition of a special event is an outdoor gathering of at least 50 individuals, whether on public or private property, assembled with a common purpose for a period of one hour or longer. Special events include, but are not limited to, concerts, fairs, carnivals, circuses, parades, flea markets, marathons, walk-a-thons, festivals, races, bicycle events, celebrations, or any other gatherings or events of a similar nature. Special events do not include non-commercial events held on private property, such as graduation parties or social parties.