National Pizza Party Day in USA
National Pizza Party Day in USA is held on May 17. Held on the third Friday of May. This event in the second decade of the month May is annual. 
Help us
Help us 
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 Barbecue Day in USA on May 16
Bread Festival in France on May 16
National Mimosa Day in USA on May 16
National Cherry Cobbler Day in USA on May 17
National Pinot Grigio Day in USA on May 17 (You must be 21 or older to host this event);
Walnut Day on May 17
World Whisky Day on May 18 (Third Saturday of May);
National Cheese Souffle Day and I love Reese’s Day in USA on May 18
May Restaurant Day on May 18 (is occurs once per season. The third Saturday of February, May, August, and November);
National Marshmallow Day in Melbourne, Australia on May 18
Pretzel Festival on the Landskrone on May 18 (Heppingen)