We remember Easter foremost for the resurrection. The Lord remembers it foremost for the suffering in Gethsemane. In 1829, the Lord shared His reflection in a revelation to Joseph:
Therefore I command you to repent—repent, lest I smite you by the rod of my mouth, and by my wrath, and by my anger, and your sufferings be sore—how sore you know not, how exquisite you know not, yea, how hard to bear you know not. For behold, I, God, have suffered these things for all, that they might not suffer if they would repent; But if they would not repent they must suffer even as I; Which suffering caused myself, even God, the greatest of all, to tremble because of pain, and to bleed at every pore, and to suffer both body and spirit—and would that I might not drink the bitter cup, and shrink— Nevertheless, glory be to the Father, and I partook and finished my preparations unto the children of men. Wherefore, I command you again to repent, lest I humble you with my almighty power; and that you confess your sins, lest you suffer these punishments of which I have spoken, of which in the smallest, yea, even in the least degree you have tasted at the time I withdrew my Spirit. (D&C 19:15-20.)
It was important for the Lord to attain the resurrection, for it completed the process that frees mankind from death. But it was more important for the Lord to free us from sin. Because of what He accomplished in Gethsemane, we are able to be reconciled to God. It was “sore… exquisite… hard to bear…” and caused Him to “tremble because of pain,” and ask His Father that He might not drink the bitter cup. It caused the “greatest of all” to “shrink” away from the abyss of suffering.
By partaking anyway, and despite His desire to be spared, He “finished [His] preparations unto the children of men.” It was only “preparation” of an atonement because we are required in turn to receive its benefit through baptism and repentance. If we are unwilling to do this then it is as if no atonement were made for our sins, and we then are called upon to likewise suffer. The Lord has explained that if we refuse to repent then “our sufferings shall be sore.” Almost incomprehensibly difficult for us to bear.
The greatest response to the Easter celebration would be repentance and baptism.