National Vinegar Day

Takes place two times annually, on the 31st of the month of December and on the 1st of the month of November.

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References:
nationaldaycalendar.com/national-vinegar-day-november-1/
foodimentary.com/2012/12/31/december-31-nationa-vinegar-day/
www.cdkitchen.com/…/National-Vinegar-Day.html