International Pizza Cake Day
International Pizza Cake Day is held on April 18. This event in the second decade of the month April is annual. 
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Pizza cake is a Canadian multiple-layer pizza baked in a pot or cake pan. First invented by Boston Pizza, recipes were posted online as early as April 2014, though they did not become viral until the Pillsbury Company posted an example in September 2014. International Pizza Cake Day, observed every year on the Third Thursday of April.
Along with the glutamate, during the pizza cooking process, the maillard reaction brings forward the flavor compounds that give pizza its distinct flavor. During the cooking process, the sugars and amino acids in the dough and pizza toppings converge to create the flavor compounds.
The psychological response to pizza’s ingredient combinations is partially explained by the fact that highly processed foods like pizza, with added amounts of fat, refined carbohydrates and salt, are most associated with behavioral indicators of addiction, such as loss of control over consumption, cravings and continued consumption despite negative consequences, according to Erica M. Schulte, a doctoral candidate in clinical psychology at the University of Michigan who authored the recent study.
Similar holidays and events, festivals and interesting facts
Malbec World Day on April 17 (Malbec is a purple grape variety used in making red wine. MWD is celebrated to commemorate the day when president Domingo Faustino Sarmiento of Argentina officially made it his mission to transform Argentina's wine industry. On that day, back in 1853, he tasked Michel Aimé Pouget, a French soil expert, to bring over new vines);
National Cheeseball Day in USA on April 17
National Espresso Day in Italy on April 17
Bat Appreciation Day on April 17
Blah Blah Blah Day on April 17 (is the opportunity to stop procrastinating and get to grips with all those stalled projects and broken promises right now);
Ford Mustang Day on April 17 (The Ford Mustang was first introduced to the world in April of 1964);
Haiku Poetry Day on April 17
Kickball Day on April 17
National Animal Crackers Day in USA on April 18
World Trifle Day on April 18
World Amateur Radio Day on April 18 (Every April 18, radio amateurs worldwide take to the airwaves in celebration of World Amateur Radio Day. It was on that day in 1925 that the International Amateur Radio Union was formed in Paris);
Pet Owners Independence Day on April 18
High Five Day on April 18
National Velociraptor Awareness Day in USA on April 18
National Rice Ball Day in USA on April 19
Garlic Day on April 19
World Bicycle Day on April 19 (The events of the first LSD trip in April 19, 1943, now known as “Bicycle Day”, after the bicycle ride home, proved to Hofmann that he had indeed made a significant discovery: a psychoactive substance with extraordinary potency, capable of causing significant shifts of consciousness in incredibly low doses);
International Cat Lady Day on April 19
Hanging Out Day on April 19
Poetry And The Creative Mind Day on April 19