1    1513 - Spanish explorer Ponce De Leon sighted Florida and claimed it for the Spanish Crown after landing at the site of present day St. Augustine, now the oldest city in the continental U.S.
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5    National Read a Road Map Day
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7    World Health Day
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9    National Cherish an Antique Day
      National Library Workers Day
10  National Siblings Day
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12  National Record Store Day
13  National Thomas Jefferson Day
14  National Look Up At The Sky Day
15  Patriot's Day
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20  Chinese Language Day
      Easter

21  British National Tea Day
22  National Earth Day
23  World Book Day
      Happy Birthday William Shakespeare! 
24  1800 - The Library of Congress was established in Washington, D.C.
25  World Penguin Day
26  National Audubon Day
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28  Maryland Joined the Union 1788
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30  International Dance Day
           National Military Brats Day
           Louisiana Joined the Union 1812