Flashlight Day
Flashlight Day is held on December 21. This event in the third decade of the month December is annual. 
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The first flashlights were invented in the mid to late 1890s, by David Misell, an English inventor who started working for the American Electrical Novelty and Manufacturing Company, which later became the American Eveready Company, owned by Conrad Hubert, a Russian living in the US who also patented some of his own flashlight inventions.
Because batteries and bulbs were still being perfected at the time, the light source often flickered due to poor connectivity. Since people were only getting flashes of light, they were nicknamed flashlights and the name stuck!
In addition to lighting the way at night, flashlights can be used to find people who require rescue, and a great tool for people who need rescuing to signal for help. If you are stranded at night without a flashlight, it is nearly impossible for rescuers to see you.
Similar holidays and events, festivals and interesting facts
Go Caroling Day on December 20
Humbug Day on December 21 (This day was created to allow us an opportunity to express our frustrations);
Look on the Bright Side Day on December 21
Roots Day on December 23
HumanLight Day on December 23 (is a secular holiday that focuses on the "positive, secular human values of reason, compassion, humanity and hope");
Festivus on December 23 (a holiday made popular by the sitcom Seinfeld, as an alternative to the pressures and commercialism of the Christmas season);
Whiner's Day on December 26
Thank You Note Day on December 26