National Pizza Party Day in USA
National Pizza Party Day in USA is held on May 21. Held on the third Friday of May. This event in the third decade of the month May is annual. 
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Every pizza can be its own party. Unless you’re buying it by the slice or in personalized sizing, pizza pies are made to be shared. National Pizza Party day honors the official event though, the real McCoy, the celebration designed around the consumption of a lot of pizza.
"The real McCoy" is an idiom and metaphor used in much of the English-speaking world to mean "the real thing" or "the genuine article", e.g. "he's the real McCoy".
Similar holidays and events, festivals and interesting facts
National Quiche Lorraine Day and National Pick Strawberries Day in USA on May 20
National Strawberries and Cream Day in USA on May 21
National Vanilla Pudding Day in USA on May 22
National Taffy Day in USA on May 23
Common Malsharing Day in Finland on May 23 (Måltidens gemenskapsdag);
National Coffee Day in Brazil on May 24
National Escargot Day in USA on May 24
Completo Day in Chile on May 24