There is NO reason for you to celebrate Pesach, it is a Jewish holiday that has NO relevance for you.
The last supper was NOT a Passover Seder, you own book states the same. John 13:29 For some of them thought, because Judas had the bag, that Jesus had said unto him, Buy those things that we have need of against the feast; or, that he should give something to the poor.
To buy for the feast they just ate ? How Does that work ?
Passover is one of the most widely celebrated Jewish holidays and commemorates the biblical story of Exodus, when Hebrew slaves were released from bondage in Egypt. Called "pesach" (pay-sak) in Hebrew, Passover is a celebration of freedom.
Passover is celebrated for seven days in Israel and for eight days in the Diaspora (outside of Israel). The reason for this difference has to do with the way the ancient calendar worked.
The Passover Seder
Every year, Jews are commanded to retell the Passover story. This usually takes place during the Passover Seder, which is a service held at home as part of the Passover celebration. It is always observed on the first night of Passover, and in some homes on the second night as well. On both nights, the seder concludes with a dinner.
Kosher for Passover?
Passover is a holiday that has certain dietary restrictions associated with it. The biggest one has to do with eating unleavened bread, called matzah. This custom comes from the part of the Passover story that says the Hebrew slaves fled Egypt so quickly that their bread didn't have time to rise. Matzah is a kind of bread that is made without yeast and not allowed to rise, so eating it in remembrance of this part of the story is a way to bring some of the Passover narrative to life.
In addition to eating matzah, Jews avoid any leavened bread during the week of Passover. They also avoid eating any food products containing wheat, barley, rye, spelt, or oats if they have leavening. According to tradition, these grains naturally rise if they are not cooked in 18 minutes and are called "chametz" during Passover. In the Ashkenazi tradition corn, rice, millet and legumes are also on the no-no list. Because things like corn syrup and cornstarch can be found in unexpected places, the easiest way to avoid inadvertently violating the rules of kashrut during Passover is to only use food products that are specifically labeled "Kosher for Passover."