Interesting how the date keeps moving around...makes it hard to plan for...
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The observance isn’t codified as a national holiday; in the past Congress has approved resolutions from year to year marking the day. That observation hasn’t always been consistent. In years past it was observed in May, and later in March. In 2019 and beyond, there was a push to have the holiday honored each year consistently on March 21
In 2020, the March 21 deadline was missed. Likely due to lawmakers being preoccupied with legislation related to the global coronavirus pandemic. In 2020, the National World War Two Museum chose to observe the day on June 2.

One of the most famous versions of her image as we know it today is based on a real-life person named Mary Doyle Keefe, and it was created by American illustrator and painter, Norman Rockwell.