Sheelah's Day
Sheelah's Day is held on March 18. Ireland, Canada, Australia. This event in the second decade of the month March is annual. 
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Sheelah's Day is celebrated the day after the Feast of St. Patrick.
According to Irish folklore and mythology, Sheelah was either the wife or mother of St. Patrick, and the holiday served to commemorate her life.
Similar holidays and events, festivals and interesting facts
Saint Urho's Day on March 16 (Finnish Americans and Finnish Canadians);
Dietitians Day in Canada on March 19 (Celebrated on the third Wednesday of March);
Senior Skip Day or Beach Day in the USA and Canada on March 21 (The date for missing the lessons varies among different schools);
Harmony Day in Australia on March 21
Puppy Day on March 23
Historic start of the new year on March 25 (Lady Day in England, Wales, Ireland, and the future United States until the adoption of the Gregorian calendar in 1752. The year 1751 began on 25 March; the year 1752 began on 1 January. It is one of the four Quarter days in Ireland and England);
Purple Day in Canada and United States on March 26