Argentina (Rio Negro) : public and bank holidays, closure of banks, stock exchanges, school vacations

Secular holiday : Commemoration of the 1976 coup that ushered in the last dictatorship of the country. Paid holiday when falling on Saturday or Sunday

Secular holiday : Veterans Day and tribute to the fallen in the Malvinas War Paid holiday when falling on Saturday or Sunday

Catholic or protestant : Maundy Thursday: Commemorates the Last Supper when Jesus instituted the Holy Eucharist (Lord's Supper).

Catholic or protestant : The First Council of Nicaea (a gathering of bishops in the early days of Christianity) wanted to find a day to commemorate the crucifixion and resurrection of Christ. This commemoration had to be linked to Jewish holiday traditions, since the last supper of Christ was believed to be a Jewish Passover meal. But the Jewish calendar is based on lunar and solar cycles, so the Easter celebration had to follow the same calendar.

Special Events :

Secular holiday : Chicago, Saturday May 1st, 1886: 350,000 workers go on strike to call for an 8-hour working day. Industries are paralyzed nationwide. On Monday, as demonstrations go on, the police open fire. On Tuesday, Chicago is again on strike. Following a bomb launched against them, the police shoot again. 12 dead, of which 7 policemen. 8 anarchists will be condemned and executed. In 1889, the Socialist International Movement met in Paris and declared this day international workers' day . The Soviets will follow suit, just as the Nazis. In France, under the Vichy regime (1940-1944), the celebration is renamed Labour Day .

Secular holiday : Anniversary of the 1810 Revolution ( Revolución de Mayo )

Secular holiday : Census day

Secular holiday : 8 February 1785 – 17 June 1821) was a military leader and popular caudillo who defended northwestern Argentina from the Spanish during the Argentine War of Independence [Wikipedia]

Secular holiday : Census day

Secular holiday : Commemorates the death of Manuel Belgrano, (1770 - 1820) an Argentine lawyer, politician, and general in the first autonomous government of Argentina who in 1812, created the national flag of Argentina. It was raised for the first time on February 27 of that year, in an island in the Parana River, opposite the city of Rosario. He also led the Jujuy Exodus (Exodo Jujeno), which prepared the ground for victories of the Argentine War of Independence in the northwest of the country. Official day of celebration is June 20.

School holidays :

Secular holiday : Obtained from Spain in 1810

School holidays :

Secular holiday : José Francisco de San Martín y Matorras (Yapeyú, Viceroyalty of the Rio de la Plata, 25 February 1778 – Boulogne-sur-Mer, France, 17 August 1850), known simply as José de San Martín or El Libertador of Argentina, Chile and Peru, was a Spanish-Argentine general and the prime leader of the southern and central parts of South America's successful struggle for independence from the Spanish Empire who served as the Protector of Peru. Born in Yapeyú, Corrientes, in modern-day Argentina, he left his mother country at the early age of seven to study in Málaga, Spain.

School holidays : observed in primary schools only [Wikipedia]

Culture : only in Tucumán, Bahía Blanca, Mercedes, Chascomús, and Viedma.