Malvinas Day in Argentina
Malvinas Day in Argentina is held on April 2. Día del Veterano y de los Caídos en la Guerra de las Malvinas. This event in the first decade of the month April is annual. 
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Malvinas Day was first introduced on 22 November 2000, and replaced the "Day of Argentine Sovereignty over the Malvinas, Sandwich and South Atlantic Islands" (Día de los Derechos Argentinos sobre las Islas Malvinas, Sandwich y del Atlántico Sur) observed on 10 June, which had until then commemorated the appointment by Buenos Aires of Luis Vernet as governor of the islands in 1829.
The holiday is a tribute to Argentina's soldiers killed in the Falklands War, which began with the Argentine invasion of the islands on 2 April 1982. A total of 649 Argentines—633 military and 16 civilian—lost their lives during the 74-day occupation.
Argentina National Water Day on March 31
AulaVereda National Day in Argentina on April 5
Night of Destiny on April 6
Researcher's Day or Science and Technology Day in Argentina on April 10
National Rowing Day in Argentina on April 11
World Mixed Sandwich Day on April 12
Kinesiology Day in Argentina on April 13