Truth and Justice Day (Día de la Memoria por la Verdad y la Justicia)
(24 March, Argentina)
Commemorates victims of the "Civic-military Dictatorship" which came to
power through a coup on 24/3/1976
Freedom Day (Jum il-Ħelsien) (31 March, Malta)
"On 31 March 1979 the last British Forces left Malta. For the first time
in a millennium, Malta was no longer a military base of a foreign power
and it became independent de facto as well as de jure."
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Oh, there's also
Greek Independence Day (25 March, Greece and Cyprus)
It's also the Feast of the Annunciation, said to have been chosen by the revolutionaries of 1821 as the start of their struggle against Turkish rule. https://en.wikipedia.org/wiki/Celebration_of_the_Greek_Revolution