Superman Day
Superman Day is held on June 12. Superman was first created in 1933 by Joe Shuster and Jerry Siegel, the writer and artist respectively. This event in the second decade of the month June is annual. 
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His original name on the planet Krypton was Kal-El. Kal-El began on the planet Krypton. He was born to Jor-El and Lara during a time of amazing distress on the planet. In most incarnations, Krypton was set to explode due to its unstable core, which leads Jor-El and Lara to send their baby off to another planet.
Regardless of the countless incarnations and interpretations surrounding Superman’s history, he will continue to stand as a symbol of hope, truth, and justice.
Similar holidays and events, festivals and interesting facts
Indomitable Passion Day on June 11
Red Rose Day on June 12
Loving Day on June 12 (is the biggest multiracial celebration in the United States. This is anniversary of the 1967 United States Supreme Court decision Loving v. Virginia which struck down all anti-miscegenation laws remaining in sixteen U.S. states.");
Sewing Machine Day on June 13
World Wide Knit in Public Day on June 14
International Surfing Day on June 15 (was established in 2005 by Surfing Magazine and The Surfrider Foundation);
US Hollerin' Contest Day on June 15
Magna Carta Day in Britain on June 15
Nature Photography Day on June 15
Smile Power Day :) on June 15