The celebration of Passover by the Jewish community today has its roots in biblical tradition. However, it is not the same celebration as was conducted by Jews at the time of the Roman occupation and the beginnings of Christianity. It reflects more of a Medieval influence.
Jesus himself is our Passover; he is the Paschal Lamb! He is our Pesach. Is this not what we hear in the Roman Rite before approaching the altar for Holy Communion? The priest, addressing the assembly, cries out, "This is the Lamb of God who takes away the sins of the world . . ." to which we respond, "Lord, I am not worthy to receive you, but only say the word and I shall be healed!"