Record Store Day
Record Store Day is held on April 20. This event in the second decade of the month april is annual.
Barbershop Quartet Day on April 11 (On April 11, 1938 the Society for the Preservation and Encouragement of Barbershop Quartet Singing in America was founded in Tulsa, Oklahoma);
Eight Track Tape Day on April 11 (It's origin likely hails from the sixties and seventies);
National Choro Day in Brazil on April 23 (Dia Nacional do Choro);
Festival of the Legends of Wallenata in Colombia on April 30 (Festival de la Leyenda Vallenata);
Chicken Dance Day on May 14 (“Der Ententanz” was the name of the song that inspired all of this, and while the dance has come to be called “The Chicken Dance”, the song itself is called The Duck Dance);