ב"ה
While it's not a commanded biblical "feast day" as Hebrew roots folks like to say, it is a great day of celebration for Judah so you folks from another tribe can enter in and celebrate with us how Hashem used a beauty queen and a righteous dude to save our ancestors from a would-be holocaust in the Persian empire.
This can be a really fun day for families. We read through the entire scroll / book of Ester; many communities let the girls do the reading aloud so it's a day for them to shine in recognizing the great roll model in Queen Ester who risked her life for the nation.
People like to dress up like biblical characters, mostly Mordechai. Ester, Achashveros (however you spell that lucky King's name). I just remembered a song I liked decades ago, Achashveros - it's a parady of "Amadeos".
Family is asleep and my headphones are dead so maybe it's not as funny as I remember, listen at your own risk.
If you are studying Hebrew now could be a really cool time to bone up on the vocabulary in Ester so reading the scroll/book can be more enjoyable (i.e. understandable).