Cubicle Day
Cubicle Day is held on April 28. Designed by Robert Propst and known for a complete absence of individuality, cubicles were first introduced in 1967 as a way to subdivide open office space and provide workers with a degree of privacy. This event in the third decade of the month April is annual. 
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With tall skyscrapers and plenty of space to arrange workers, American companies transformed the white collar workplace from rows of corridor offices to the layout we associate with 1950s office design: private offices arranged around each floor's perimeter, with row upon row of neatly ordered desks in the center where the secretaries or accountants or stenographers sat.
Though Europeans referred to "Mad Men"-style offices as American plan, it was actually two German brothers who dreamed up the first open-plan office. They called Bürolandschaft, or "office landscape." The person who invented the forerunner of today's cubicle was an art professor with patents in playground equipment, heart valves and livestock-tagging machines.
Source: washingtonpost.com
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