The date the gezera of Haman harasha was nullified. And Mordechai was given the go ahead to write whatever he wanted re the Jews. So too we can pray to nullify all evil decrees that were even sealed by the King and write what good decrees we want for ourselves that the King will seal on in this day.
Give tzedzka and light a candle for Mordechai and one for Esther, read the relevant parts in the Megila. Chapter 8 passuk 8 & 9:
https://www.sefaria.org/Esther.8.8?lang=bi
And chapter 22 in Tehillim:
https://www.sefaria.org/Psalms.22?lang=bi
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