And on the first day of Unleavened Bread, when they killed the Passover lamb, his disciples said to him, “Where will you have us go and prepare for you to eat the Passover?”
Mark 14:12

In the first part of this verse, "Killed the Passover" refers to the lamb, not to the ritual or the day. So in the second part, "eat the Passover" also refers to the lamb, not to matzo or a seder or some other special meal. Yeshua's disciples were preparing to eat a Passover lamb the night before he was crucified.