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Special meal in memory of Haman’s death:[1]

One is to enhance his meal on the 16th of Nissan in honor of the meal which Queen Esther made with Haman and Achashveirosh on the 16th of Nissan, which then led Haman to be hung.[2]

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[1] Admur 490:2; Magen Avraham 490:1 in name of Shlah; See Sichas 2^nd night of Pesach 1925

[2] The explanation: Esther and the Jewish people fasted on the 13th, 14th and 15th. Accordingly, she made the 1st meal by the 15th and the 2nd by the 16th and Haman was hung on the 16th by the second meal. [Pirkei Derebbe Eliezer 3 and Midrash Raba Esther, brought in Kaf Hachaim 490:1] Alternatively, the Jewish people fasted on the 14th, 15th, 16th, and the first meal took place on the 15th [and thus Esther only fasted two days] and the second meal took place on the 16th, and Haman was hung on the 16th. [Rashi Megillah 15a, brought in Machatzis Hashekel on M”A ibid and Kaf Hachaim ibid] Thus, according to both approaches, both the second meal and death of Haman occurred on the 16th, as rule the Poskim ibid. However, others hold that Haman was only hung on the 17th. [Yalkut Shimoni 1053; Mesores Hashas on Rashi in Megillah ibid that perhaps according to Rashi Haman was killed on the night after the 16th] According to the approach of the Yalkut Shimoni it is possible that the first meal took place on the 16th and the second meal on the 17th, or that it took place as explains Mesoros Hashas ibid, that Haman was hung that night. If one were to accept that the second meal took place on the 17th, then it would be understood how Mordechai was allowed to ride a horse on that day, as it was no longer Yom Tov.