Dita e Verës (14 March)

"an Albanian spring festival and pagan holiday....for the beginning of the spring-summer period."
Celebrated officially on 14 March in Albania, unofficially in other countries where there are Albanians.
https://en.wikipedia.org/wiki/Dita_e_Ver%C3%ABs
Alb dita 'day', e 'of', verë 'summer'.
But it's not summer yet, even in Albania!
Note the above slightly slidy wording.
Verë looks as if it might be from Latin vēr 'spring' (PIE *wes-).
Could have been a semantic shift, I guess.
Modern Alb has another word for 'spring' - sustë.
Further into this unfamiliar territory I will not venture.
Oh yes, it's also (according to my upstairs calendar):
Purim (a Jewish holiday that commemorates the saving of the Jewish people from annihilation at the hands of an official of the Achaemenid Empire named Haman, as it is recounted in the Book of Esther)
https://en.wikipedia.org/wiki/Purim
Holi (Hindu festival of colours, love and spring -- it's the one where they throw coloured powders all over each other)
https://en.wikipedia.org/wiki/Holi
Neither of these seems to be a national holiday in any country, but they will be celebrated by Jews resp. Hindus in many parts of the world.
Interestingly, they are both precisely defined as extending from evening (on the 13th) to evening (14th).
/ObSci.lang  Etymological notes:
"Purim is the plural of the Hebrew word pur (loan from Akkadian puru) meaning "lot".Its use as the name of this festival comes from Esther 3:6–7, describing the choice of date:
     6: [...] having been told who Mordecai's people were, Haman plotted to do away with all the Jews, Mordecai's people, throughout the kingdom of Ahasuerus.
     7: In the first month, that is, the month of Nisan, in the twelfth year of King Ahasuerus, pur—which means "the lot"—was cast before Haman concerning every day and every month, [until it fell on] the twelfth month, that is, the month of Adar.
[That is, an act of divination to determine an auspicious day on which to carry out his wicked plan.]
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Holi is supposed to be from Holika, the name of an asuri in Hindu mythology, elsewhere called a "demon"...Oh, read the story.
https://en.wikipedia.org/wiki/Holika