World Riesling Day
World Riesling Day is held on March 13. The First Annual Riesling Birthday was celebrated in 2019. This event in the second decade of the month March is annual. 
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The date references the first written evidence of the Riesling grape: an invoice dated March 13, 1435. Found in cellar log located in Rüsselsheim, just east of the Rheingau region, the document invoices Count John IV of Katzenelnbogen for six vines of Riesling planted in the vineyard of a local winery. Alles Gute zum Geburtstag, Riesling! Wines of Germany announced that March 13 will henceforth be known as the official birthday of Riesling.
Similar holidays and events, festivals and interesting facts
National Cold Cuts Day, Mulled Wine Day and National Moscow Mule Day in USA on March 3
Malbec World Day on April 17 (Malbec is a purple grape variety used in making red wine. MWD is celebrated to commemorate the day when president Domingo Faustino Sarmiento of Argentina officially made it his mission to transform Argentina's wine industry. On that day, back in 1853, he tasked Michel Aimé Pouget, a French soil expert, to bring over new vines);
International Sauvignon Blanc Day on May 3 (The First Annual Sauvignon Blanc Day was celebrated in 2009. Celebrated always on the first Friday in May);
National Foodies Day and Moscato Day in USA on May 9
World Moscato Day on May 9 (Moscato, or Muscat in Italian, is one of the oldest known variety of grapes grown in the world);
National Pinot Grigio Day in USA on May 17 (You must be 21 or older to host this event);
International Chardonnay Day on May 23 (Celebrated on the Thursday before U.S. Memorial Day each year thanks to the creator Rick Bakas)