Purim starts on the 20th at sundown.
Purim is the celebration of the survival of the Jews in the first attempted Jewish genocide. It's in Esther, chapter 9.
The day before Purim, the king turns on his ten sons and has them executed for attempting to kill off the Jews.
It's a very relevant story.
Esther, chapter 9.
The 19th is [-0]
L'chaim