What weird holiday in on March 30? Any help from MLIAers?

If you are a MLIAer (MyLifeIsAverage) you should know what I'm talking about when I say 'weird holiday'. Like 'Sneak-A-Zucchini-Onto-Your-Neighbours-Porch Day'? What holiday like that is on March 30? I tried Google, but nothing came up. Please help?
 
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