We have no idea, since Christian occasions are not acknowledged in Judaism, and the Jewish calendar does not correspond exactly to the Gregorian one. The two may coincide once in a decade or two, but this is not deliberate. See also:
There are always Jews who celebrate Passover regardless of the location or circumstances. Jews celebrated Passover in the ghettos, and then in the concentration camps.
Yes, because Passover is a Jewish festival. see also:What_do_Jews_do_when_celebrating_passover
Irish Jews celebrate Passover the same way as Jews all over the world.
No. Good Friday is Christian and always occurs on a Friday. Passover is a Jewish festival and occurs on a different day. They are usually close to each other, but not always together and they are celebrating different things. Passover is not celebrated by Christians and Good Friday is not celebrated by Jews.
German Jews celebrate Passover, too.
Passover is usually only celebrated by Jews
Good Friday is not a Jewish occasion nor is it based on a Jewish Holiday as it deals exclusively with the life of Jesus. To see how Christians celebrate Good Friday, see the related question below.
The same way that all other Jews observe Pesach (Passover).
Jewish people celebrate Passover to celebrate their people's liberation from slavery. The holiday celebrates when Jews were freed from slavery in Ancient Egypt.
Jews still celebrate Passover to this day.
There is no such thing as a "reformed" Jew. It is called "reform Jew". Reform Jews celebrate passover as a commoration of the exodus of the ancestors of the Jews from Egypt and into freedom, which is the same meaning passover has to Conservative and Orthodox Jews.
the event they celebrate passover is exodus