What happened on March 15 ?

In the Roman calendar, the Ides of March.

Turkey buzzards return to Hinckley, Ohio.

International Day Against Police Brutality

For corporations in the United States that use the calendar year as their fiscal year, the date on which the corporation must file its corporate income tax return

Constitution Day in Belarus

National holiday in Hungary celebrating the 1848 Revolution. (See also Public holidays in Hungary)

World Consumer Rights Day [2]

In Japan, Hounen Matsuri

Saint Clemens Maria Hofbauer (died 1820)

Blessed Arnicus of Averbode

Saint Luise of Marillac

Saint Lucretia