A: The date of 27th of Nisan was established as a law in Israel in 1951, signed by David Ben-Gurion. It was a compromise between two opposing groups in the Knesset after a very intense period of negotiations. The day commemorates the Warsaw Ghetto Uprising in 1943 which began on Pesach. The Orthodox Jews wanted to push the date as far as possible from Passover so the day of mourning would not overshadow the celebrations. However, the date could not be pushed too far since it would come too close to Yom HaAtzmaut (Independence Day). Thus, the compromise.
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