Esther found out about Haman’s decree to kill all the Jews. She wanted to hide her religion instead of confronting the king, but Mordecai said all the Jews would be killed if she didn’t so she said to  Mordecai tell every Jew to fast for 3 days and then she would confront the king and ask to have a banquet with Haman and the king. At that banquet she asked to have another banquet the next day.