International Pizza Cake Day
International Pizza Cake Day is held on April 15. 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
Myanmar Water Festival on April 14
National Coffee Day in Portugal on April 14
National Pecan Day in USA on April 14
Black Day on April 14 (South Korea, Japan, Taiwan. An unofficial holiday celebrated annually by single people - unmarried or unmarried people);
Wine Journalist's Day in Argentina on April 14
International Moment of Laughter Day on April 14 (is focuses on laughter as a way to de-stress);
America Day on April 14 (Día de las Américas [es] with the support of the Organization of American States);
International Goalkeeper Day on April 14
World Chagas Disease Day on April 14
International Provenance Research Day on April 14 (Held on the second Wednesday of April);
Look Up at the Sky Day on April 14
Reach as High as You Can Day on April 14
That Sucks Day on April 14 (Throughout the history of the holiday and the organization that sponsored it, That Sucks LLC, they seek to exemplify all that is terrible and wrong in the world);
N'Ko Alphabet Day on April 14 (Mande speakers);
National Glazed Ham Day in USA on April 15
National Day of Chilean Food in Chile on April 15
World Art Day on April 15
Universal Day of Culture on April 15
International Biomedical Laboratory Science Day on April 15 (is celebrated annually on 15 April to promote and acknowledge the role of biomedical laboratory professionals in diagnostic and preventative healthcare organisations);
International Microcredit Day on April 15
Rubber Eraser Day on April 15 (Joseph Priestley discovered the eraser in 1770, using pieces of rubber imported from Brazil. Then in 1858, Hyman Lipman of Philadelphia, Pa., patented the pencil with an eraser at the end);
Take A Wild Guess Day on April 15
Stoker's Day on April 15 (is celebrated in spring, at the end of the heating season. All shifts workers gether in the boiler room to extinguish the boilers and begin to celebrate. The date of this celebration is not fixed. The local authorities decide when to start and when to finish the heating season but usually it hapends not later than April 30 if the average air temperature is above +8 for 3 days in a raw);
National Eggs Benedict Day, National Baked Ham with Pineapple Day and Day of the Mushroom in USA on April 16
World Day Against Child Slavery on April 16
World Entrepreneurship Day on April 16
World Leisure Day on April 16
Foursquare Day on April 16
Wear Your Pajamas To Work Day on April 16
National Tickle Day in USA on April 16
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