Grandparents' and Grandchildren's Day or Grandson Day in Michigan
Grandparents' and Grandchildren's Day or Grandson Day in Michigan is held on March 18. This event in the second decade of the month March is annual. 
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Today is Grandparents' and Grandchildren's Day in Michigan! March 18 of each year shall be known as "grandparents' and grandchildren's day". History: 1985, Act 186, Eff. Mar. 31, 1986.
National Grandparents Day has multiple origins. In any case, National Grandparents Day was ultimately signed into law by President Jimmy Carter in 1978. Marian McQuade received a phone call from the White House to inform her of this development. Many individuals believe that National Grandparents Day was inspired by her endeavors. A presidential proclamation on September 6, 1979, officially established this day. It designated Sunday, September 9, 1979, as National Grandparents Day, falling on the ‘first Sunday of September following Labor Day.
Similar holidays and events, festivals and interesting facts
Children's Day in Bangladesh on March 17
Minna Canth's Birthday in Finland on March 19 (Finnish writer, playwright, journalist, author of short stories, novels and plays, the first famous woman writer in Finland. Born March 19, 1844. Since 2007, Gender Equality Day has been celebrated in her honor);
Saint Joseph's Day or Father's Day on March 19 (in Andorra, Angola, Spain, Portugal, Italy, Switzerland, Honduras, and Bolivia);
Father's Day in Croatia on March 19 (celebrated on Saint Joseph's Day);
World Fairy Tale Day on March 20 (arose on the initiative of Sweden in 1991);
Mother's Day in most of the Arab world on March 21 (Bahrain, Comoros, Djibouti, Egypt, Iraq, Jordan, Kuwait, Libya, Lebanon, Mauritania, Oman, Palestine, Qatar, Saudi Arabia, Somalia, Sudan, Syria, United Arab Emirates, Yemen);
International Colour Day on March 21 (The adoption of an international day of colour was proposed in 2008 by the Portuguese Color Association, whose president, Maria Joao Durao, presented the idea to the International Colour Association. The proposal was agreed in 2009 among the members of this society, which is composed of national associations and members representing more than 30 countries)