Donald Duck Day
Donald Duck Day is held on June 9. Donald first appeared to us in a 1934 film called The Wise Little Hen, a retelling of the original little red hen story. This event in the first decade of the month June is annual. 
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That’s right, unbeknownst to most Donald fans, he is a twin! His sister, mother to Donald’s nephews Huey, Dewey and Louie, goes by different names (she’s been referred to as Della, Dumbbells or Thelma, depending on the source). She hasn’t been in the limelight as much as her famous brother, so we don’t know a whole lot about her, other than the fact that she exists.
Similar holidays and events, festivals and interesting facts
Best Friends Day on June 8
Name Your Poison Day on June 8
Upsy Daisy Day on June 8
International Housewife's Day on June 8
Ball Point Pen Day on June 10 (In June of 1943 the Bíró brothers, László and György, became owners of US Patent 2,390,636 – better known around the world as the ball point pen);
World Ice Cream Day on June 10
Indomitable Passion Day on June 11
Medimeisterschaften or Medis Festival on June 11