National Zinfandel Day in US
National Zinfandel Day in US is held on November 20. Celebrated on the 3rd Wednesday in November. This event in the second decade of the month November is annual. 
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It is a day that is decreed by ZAP – the Zinfandel Advocates and Producers.
Zinfandel used to be a grape with an unknown origin. But according to the Wine Institute, recent studies indicate that the grape used for making California Zinfandel probably originated in Croatia.
Similar holidays and events, festivals and interesting facts
International Tempranillo Day on November 14 (Celebrated always on the 2nd Thursday of November);
International Beaujolais Day on November 21 (Date for 2024; observed on the third Thursday in November);
International Carmenère Day on November 24 (Created in 2014, this festival originally celebrated the 20th anniversary of a grape that was ‘lost,’ then rediscovered);
Cabernet Franc Day on December 4 (It's a way to prove that this variety is “More Than a Blending Grape!”);
National Sangria Day in USA on December 20
National Champagne Day in USA on December 31
International Furmint Day on February 1 (Official hashtag:#FurmintDay)