Passover serves to remind Jews of the time that they were held in slavery in ancient Egypt and how G-d rescued them. While this obviously illustrates the special relationship believed by Jews to exist between them and G-d, it also demonstrates that to try to end slavery must be a good and holy thing to do. As slavery is still very much a part of this world - be it in the form of children forced to perform bonded labour in sweat shops, sex workers smuggled into countries and forced to work in prostitution or any of the myriad forms slavery may take, Passover is every bit as relevant now as it was thousands of years ago. Many Jewish people pass around a tzedakah box during the Passover seder, into which family members and guests place donations which are then given to charities which work to end slavery and help those affected by it - this raises a great deal of cash for these charities each year.
Passover is celebrated in the home, everywhere Jews live.
Beefeaters
Passover is usually only celebrated by Jews
Passover is celebrated in the home.
Passover was (and is) celebrated starting the 15th of Nissan all over the world.
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For Pesach (Passover), see this answer: Why is Pesach celebrated?
The Lord's Table, first celebrated in conjunction with Passover, is not the same as "last passover." The last Passover has yet to be celebrated; it is still being celebrated to this day. Jesus said He did not come to destroy the law but to fulfill the law. Celebrating and observing Passover was part of the law. The first Lord's Table (Supper) did not put an end to Passover or its observation.
Easter
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Passover is celebrated on the 15th of nissan, corresponding to about April, give or take a month. In Israel, Passover is celebrated for seven days. In the diaspora (outside of Israel), it is celebrated for eight days. (Nissan is the first month of the year, but calculations for the calendar are complicated.)
Passover was and is celebrated according to God's command (Exodus ch. 12).