National Rice Ball Day in USA
National Rice Ball Day in USA is held on April 19. This event in the second decade of the month April is annual. 
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If you've ever been to a Japanese convenience store, you've probably seen a bunch of triangle objects in the food area. That's an onigiri. The rice ball is traditionally Japanese. The rice balls preserve very well, and can even be used to preserve meats or other foods within its airtight seal.
The nigiri (握り) in onigiri means to "firmly hold". This comes from the procedure to make the onigiri, where you firmly grasp and hold the rice to form the onigiri shape. Onigiri gu (具) is what's inside a onigiri.
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