UNESCO first adopted 21 March as World Poetry Day during its 30th General Conference in Paris in 1999, with the aim of supporting linguistic diversity through poetic expression and increasing the opportunity for endangered languages to be heard. Read more about it here: https://www.unesco.org/en/world-poetry-day#:~:text=UNESCO%20first%20adopted%2021%20March,endangered%20languages%20to%20be%20heard.