Whistle and Whistleblower Day
Whistle and Whistleblower Day is held on July 27. This event in the third decade of the month July is annual. 
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Today is July 27, a holiday for many, and also, Whistling or Whistle and Whistleblower Day. A whistle, or whistling action, is the sound produced by expelling air through pursed lips with the occasional help of the fingers, usually high-pitched, although it can be relatively low-pitched and reach at least four octaves. The inside of the mouth acts as a sounding board and the modulation originates in the throat. In some Latin American countries and in parts of Andalusia it is called chiflido or chiflo. It has also been widely used to produce music.
Similar holidays and events, festivals and interesting facts
Summer Music Days Hitzacker on July 26
World Gaucher Disease Day on July 26
Stuttgart Flamenco Festival on July 27
Rockstadt Extreme Fest on July 30
Wacken Open Air Festival on July 30 (The biggest heavy metal festival worldwide);
HOA Festival or Headbangers Open Air on July 31
EmsFest in Rheine on July 31