What are the rules regarding flying over open-air assemblies of more than 1000 people?

The rules regarding flying over open-air assemblies of more than 1000 people are particularly stringent due to safety considerations. The answer which states that one can only fly at a height that allows safe landing in emergencies emphasizes the importance of safety both for the aircraft and the crowd below. This rule necessitates that pilots assess their altitude in relation to the assembly—not just to comply with a numerical height requirement, but primarily to ensure that in the event of an emergency, they have sufficient altitude to execute a safe landing without endangering the people gathered below.

This approach prioritizes the ability to respond effectively to unforeseen circumstances and prevents dangerous situations from occurring during flight operations over large gatherings. The rules are designed to enhance safety and minimize risk to both the flight crew and those on the ground, reflecting the aviation industry's commitment to operational safety. Other answers may suggest different heights or permissions that do not adequately focus on the emergency landing capability which is crucial when flying over large crowds.