Anonymous
It's more of a commemoration than a celebration. It is a very solemn occasion and after listening to a public talk, the bread and wine are passed round but ONLY the "anointed remnant" (those who claim to be part of the 144,000 with a heavenly hope) may partake. Everyone else just passes the plate and the cup round to the next person.
They are not celebrating the death of Jesus, but remembering it. However, last year although 20,085,142 persons attended this annual event, a mere 18,013 Jehovah's Witnesses actually partook of the bread and the wine.
TeeM
As to the date of Nisan 14, Yes. But the bible gives another date, 30 days later for those who could not attend on Nisan 13.
Yet in another way, we celebrate Jesus' death everyday of our lives by living in harmony with Jesus' commandments and principles.
By loving Jehovah and our neighbor we celebrate Jesus' death, in obedience to Jesus.
By preaching the good news of the Kingdom, we honor Jesus' death as pointing to the only hope of mankind.
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Anonymous
I celebrate my blood transfusion god