Purim

"The Jews ordained and took upon themselves and upon their descendants... that these days of Purim should not cease from among the Jews, nor the memory of them perish from among their descendants… to observe these days of Purim at their appointed time" (Esther 9:27-31)

Purim, which literally means “lots” and is sometimes known as the Feast of Lots, is the Jewish holiday in which Jews commemorate being saved from persecution in the ancient Persian Empire. According to the Book of Esther in the Torah, the Jewish people of the city of Shushan were threatened by the villain Haman, a prime minister who convinces the King Ahasuerus to kill all the Jews (because the Jewish Mordecai refused to bow down to Haman). Haman casts lots (hence the name of the holiday) to determine the date he would carry out his plan: the 13th of Adar. In the end, the Jews are saved by the heroic Queen Esther, Mordecai’s niece (and adopted daughter), who married Ahasuerus (after he banished his first, rebellious wife Vashti). When Ahasuerus discovers that his wife Esther is Jewish, he decides to reverse Haman’s decree, and instead of the Jews being killed, Haman, his sons, and other enemies are killed instead.

Purim is celebrated on the 14th of Adar, the day after the Jews emerged victorious against the evil Haman.
https://toriavey.com/what-is-purim/

Chag Purim Sameach!