National Italian Beef Day and National Grape Popsicle Day in USA
National Italian Beef Day and National Grape Popsicle Day in USA is held on May 27. This event in the third decade of the month May is annual. 
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With all due respect to the Chicago-style hot dog and deep-dish pizza, no food is more "Chicago" than the Italian beef sandwich. When tracing the history of the Italian beef, all roads lead through Al’s Italian Beef on Taylor St. According to longtime Al’s owner Chris Pacelli, the sandwich's story starts around the end of World War I with a Chicago street peddler named Anthony Ferrari. Ferrari would drive around the city making deliveries of cold sandwiches and other lunches he cooked in his home to blue-collar workers at various locations around the city.
As for popsicles, cherry, root beer, lemon, banana, orange, grapes, and watermelon are the seven original popsicle flavors.
National Blueberry Cheesecake Day and National Cherry Dessert Day in USA on May 26
National Brisket Day in USA on May 28
Mayonnaise Day on May 28
National Hamburger Day in USA on May 28
National Burger Day in Australia on May 28
Mexico Nutrition Day on May 28
Spain Nutrition Day on May 28
World Hamburger Day on May 28