Vesuvius Day
Vesuvius Day is held on August 24. The Mount of Vesuvius is most widely known for it’s eruption in 79 A.D. This event in the third decade of the month August is annual. 
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It's formed of two volcanoes! While the ‘main peak’ is named Vesuvius, there is another mountain which is attached to it, Monte Somma. Atop this second mountain is a caldera, or crater, which was created following a previous eruption. Mount Vesuvius actually grew out of the top of Monte Somma.
The people of Pompeii didn't realise they lived next to a volcano. Before 79AD there was no name for volcano.
The volcano showed signs that it was about to erupt in 79 AD. When the volcano began to erupt almost 2000 years ago, it shot tons of volcanic debris into the air, which then rained down upon the surrounding towns. To give you an idea of how much debris was scattered, it was the equivalent of 250,000 elephants per second!
Similar holidays and events, festivals and interesting facts
Valentino Day on August 23 (or Rudolfo Alfonzo Raffaelo Piero Filibert Guglielmi De Valentina D’Antonguolla);
Ride the Wind Day on August 23
International Internaut Day or Internet User Day on August 23
International Strange Music Day on August 24 (The celebration was conceived by Patrick Grant, a musician from New York City. The goal of the festival is simple: to encourage people to play and listen to music that we may not yet appreciate enough);
Pluto Demoted Day on August 24
Kiss and Make Up Day on August 25
Toilet Paper Day on August 26
US & UK National Dog Day on August 26 (was founded by a woman - Colleen Paige - in 2004)