National Pizza Party Day in USA
National Pizza Party Day in USA is held on May 15. Held on the third Friday of May. This event in the second 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 Brioche Day and National Buttermilk Biscuit Day in USA on May 14
National Chocolate Chip Day in USA on May 15
Pisco Day in Chile on May 15
World Whisky Day on May 16 (Third Saturday of May);
National Barbecue Day in USA on May 16
May Restaurant Day on May 16 (is occurs once per season. The third Saturday of February, May, August, and November);
Bread Festival in France on May 16
National Mimosa Day in USA on May 16