Eight Track Tape Day
Eight Track Tape Day is held on April 11. It's origin likely hails from the sixties and seventies. This event in the second decade of the month April is annual. 
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Why is it called 8-track tape? They are called 8-track tapes because each of the four programs is comprised of two tracks playing simultaneously to provide stereo sound. Though less popular, there were also 4-track stereo tapes with two programs in the 1960s.
The cassette tape was invented in 1962 by Phillips' Belgium team, introduced to the European market in 1963, and came to America in November of 1964. Stereo 8 Cartridges (commonly known as 8 track) went on the US market in 1965. Just like a cassette tape, an 8 track tape is a magnetic analog music device.
But from when it was first introduced until it was overtaken by the compact cassette, the 8 track tape had a lifespan of nearly 20 years, and it was enjoyed by millions of people (granted, mainly in the USA, Canada, and the UK).
Similar holidays and events, festivals and interesting facts
Miyako Odori in Japan on April 1 (The Miyako Odori or 都をどり is one of Japan's best Geisha events. It features a large number of Maiko and several Geiko from the Gion district of Kyoto);
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);
Record Store Day on April 20
National Choro Day in Brazil on April 23 (Dia Nacional do Choro);
Hexentanz Festival on April 25
International A cappella Week Hanover on April 26 (Begins on Saturday of the last full week of April);
Vallenato Legend Festival in Colombia on April 30 (Festival de la Leyenda Vallenata)