Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EarthDay.org including 1 billion people in more than 193 countries.
The 3rd of May celebrates the date of the first written constitution in Europe, in 1791 – the Polish constitution. (also 3rd May National Holiday; Polish: Święto Konstytucji 3 Maja)
Cinco de Mayo, or the fifth of May, is a holiday that celebrates the date of the Mexican army’s May 5, 1862 victory over France at the Battle of Puebla during the Franco-Mexican War. The day, which falls on Wednesday, May 5 in 2021, is also known as Battle of Puebla Day.