Put your thoughts, memories and stories of Passover here. For the secular/pagan discussion of Easter please use the Easter Bunny thread.
Here's an approptiate article, excerpted from the Watchtower of 2/1/76. I have bolded your answer, and italicized some other information of relevance or interest. Bracketed comments are mine.
"Keep Doing This in Remembrance of Me"
Once a year on the Biblical date of Nisan 14, Passover night, Jehovah's dedicated people gather together in all parts of the earth in harmony with Jesus' command: "Keep doing this in remembrance of me." (Luke 22:19; Ex. 12:2-6) It is proper for the Lord's Evening Meal to be commemorated on this true Passover night, annually after sundown, in one's community.
How is this important date determined? In the first century Jesus and the early Christians accepted the determination of the date Nisan 14 (which commenced at sundown) as set by the Jewish temple priesthood in Jerusalem. It is noteworthy that Jesus celebrated the Passover meal on Nisan 14, as directed in the law of Moses. (Ex. 12:6-8; Lev. 23:5; Matt. 26:18-20) He did not eat the Passover meal on Nisan 15, as most Jews do today. After the destruction of the temple in 70 C.E., Christians had to determine the Nisan 14 Passover date themselves.
At the time when Roman Emperor Constantine made apostate Christianity the state religion (325 C.E.), the Council of Nicaea ordained that the celebration of Easter should always take place on the Sunday that immediately follows the full moon that happens upon, or next after, the day of the spring (vernal) equinox. Usually this equinox date is March 21. Should the fourteenth day from the new moon, which they regarded as the day of the full moon, fall on a Sunday, the celebration of Easter was deferred to the Sunday following. This was in order to avoid concurrence with the Jews and the minority of Christians, termed Quartodecimans, who still celebrated on the fourteenth of Nisan. In this way Christendom has come to have their "Maundy Thursday" always on a Thursday to commemorate Jesus' Last Supper, and their "Good Friday" always on a Friday to commemorate his death.
At least by 1880 Jehovah's anointed worshipers had departed from Christendom's practice of celebrating the Lord's Evening Meal several times a year and they observed it only on Nisan 14 after sundown. From then till about 1919 the anointed Christians accepted the dates as established by the Jewish calendar for the determining of Nisan 14. They realized that the Jewish calendar listed "Passover" for Nisan 15, after sundown. Nevertheless, these anointed Christians arranged to celebrate the Lord's Evening Meal on the night of Nisan 14, even as did Jesus. Still, these Christians used the Jewish calendar in accepting the determination of the month of Nisan for each year.
The modern Jewish calendar determines the beginning of their month of Nisan by the astronomical new moon. However, usually it is eighteen hours or more later when the first sliver of the crescent of the new moon becomes visible in Jerusalem. Each year, in recent times, the governing body of Jehovah's witnesses has determined the actual new moon that becomes visible in Jerusalem, which is the way the first of Nisan was determined in Biblical times. For this reason often there has been a difference of a day or two between the Memorial date of Jehovah's witnesses and the Nisan 14 date according to the modern Jewish calendar. Footnote: For the same reasons, occasionally the modern Jews find it necessary to add their intercalary thirteenth month at a different time than do Jehovah's witnesses. On such occasions, then, their Passover date comes to be a month later than the Memorial date of Jehovah's witnesses. Back to the article.
According to our present method of calculation, the Memorial date approximates the nearest full moon after the spring equinox. So if, in the future, any of Jehovah's people should be out of touch with the governing body, they could determine the Memorial date with fair accuracy from local calendars that show the first full moon after the spring equinox. The celebration would then take place after sundown of the day on which the full moon occurs.
What kinds of bread and wine are to be used? Since Jesus took unleavened bread that was used normally for the Passover, we today use unleavened bread. Some Jewish matzos are made with only wheat flour and water, and such may be used by Christians at the Memorial celebration. But we would not use matzos made with added ingredients, such as salt, sugar, malt, eggs, onions, and so forth. ["Beware the leaven of the Pharisees", remember? And the original article here contained a recipe for our Memorial Bread. If I reprinted it, you might all die like the Nazis in Raiders of the Lost Ark. ... That's a joke.] Wine provided for the Memorial should be real red wine as was used by the Jews in their Passover celebrations. Since the emblems in themselves are not sacred, after the celebration is over and the meeting dismissed, the bread and wine may be taken home and considered common, to be used at some other time as normal.-1 Sam. 21:4.
The elders make careful plans for an adequate Lord's Evening Meal celebration for the local congregation. On this one night, in all parts of the globe, the hearts and minds of Jehovah's dedicated people, the anointed and those of the "great crowd," being unitedly assembled, give praise to our Sovereign God, Jehovah. They give thanks again to Jesus Christ our Ransomer who demonstrated his great love for us by surrendering his human life for our recovery. Annually the anointed remnant and the "great crowd" delight to commemorate him as the Messianic world conqueror.-John 16:33. [End of article.]
So I again invite all to attend tonight.
[The alert reader will notice that sometimes our ways are based on mistaken information; when we find out, we change. The First Witness of Jehovah did everything perfectly; we have been trying to catch up ever since. Most people call this "progress", but to those "speaking abusively" such changes are points of ridicule. So be it. Acts 18:6; Ps 44:14-18]
Sperling, since you're knowledgeable about these things, perhaps you can tell the lurkers what praises the group sang on their way to their rendezvous with history. (Mt 26:30) Between the two of us we'll educate these goyim. :-)
Unless etc. all scriptures are NWT