Sound takes time to travel. This means that we hear things after they have happened. Sometimes we notice this and other times we do not. Sound delay is the time between when something happens and when we hear it.
A good example of this is lightning and thunder. We see lightning immediately but it takes longer for thunder to reach us. Another example is during very large concerts where the audience’s response to music may have a delayed effect. For example everyone jumping on a beat can give a quick “wave” effect as people further down the arena hear the sound.
In the event of a sudden downpour ensure there is adequate shelter for all otherwise people will start going home and won’t come back even if the skies clear. Make plans to relocate activities to sheltered areas or to alter the event programme to salvage the day if possible. Have contingency insurance for your event if there is much at stake financially.

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