There is only one very important event we are told to be in constant remembrance of...

They looked forward to it... Who hath believed our report? and to whom is the arm of the Lord revealed? [2] For he shall grow up before him as a tender plant, and as a root out of a dry ground: he hath no form nor comeliness; and when we shall see him, there is no beauty that we should desire him. [3] He is despised and rejected of men; a man of sorrows, and acquainted with grief: and we hid as it were our faces from him; he was despised, and we esteemed him not. [4] Surely he hath borne our griefs, and carried our sorrows: yet we did esteem him stricken, smitten of God, and afflicted. [5] But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed. [6] All we like sheep have gone astray; we have turned every one to his own way; and the Lord hath laid on him the iniquity of us all. [7] He was oppressed, and he was afflicted, yet he opened not his mouth: he is brought as a lamb to the slaughter, and as a sheep before her shearers is dumb, so he openeth not his mouth. [8] He was taken from prison and from judgment: and who shall declare his generation? for he was cut off out of the land of the living: for the transgression of my people was he stricken. [9] And he made his grave with the wicked, and with the rich in his death; because he had done no violence, neither was any deceit in his mouth. [10] Yet it pleased the Lord to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the Lord shall prosper in his hand. [11] He shall see of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities. [12] Therefore will I divide him a portion with the great, and he shall divide the spoil with the strong; because he hath poured out his soul unto death: and he was numbered with the transgressors; and he bare the sin of many, and made intercession for the transgressors. Isaiah 53:1-12 The Lord is my strength and song, and is become my salvation. [15] The voice of rejoicing and salvation is in the tabernacles of the righteous: the right hand of the Lord doeth valiantly. [16] The right hand of the Lord is exalted: the right hand of the Lord doeth valiantly. [17] I shall not die, but live, and declare the works of the Lord . [18] The Lord hath chastened me sore: but he hath not given me over unto death. [19] Open to me the gates of righteousness: I will go into them, and I will praise the Lord : [20] This gate of the Lord , into which the righteous shall enter. [21] I will praise thee: for thou hast heard me, and art become my salvation. [22] The stone which the builders refused is become the head stone of the corner. [23] This is the Lord's doing; it is marvellous in our eyes. [24] This is the day which the Lord hath made; we will rejoice and be glad in it. [25] Save now, I beseech thee, O Lord : O Lord , I beseech thee, send now prosperity. [26] Blessed be he that cometh in the name of the Lord : we have blessed you out of the house of the Lord . [27] God is the Lord , which hath shewed us light: bind the sacrifice with cords, even unto the horns of the altar. [28] Thou art my God, and I will praise thee: thou art my God, I will exalt thee. [29] O give thanks unto the Lord ; for he is good: for his mercy endureth for ever. Psalm 118:14-29 We look back to it in constant remembrance... And as they were eating, Jesus took bread, and blessed it , and brake it , and gave it to the disciples, and said, Take, eat; this is my body. [27] And he took the cup, and gave thanks, and gave it to them, saying, Drink ye all of it; [28] For this is my blood of the new testament, which is shed for many for the remission of sins. Matthew 26:26-28 For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the same night in which he was betrayed took bread: [24] And when he had given thanks, he brake it , and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. [25] After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink it , in remembrance of me. [26] For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come. 1 Corinthians 11:23-26 It was only through Jesus' death can we have reconciliation with God... For verily he took not on him the nature of angels; but he took on him the seed of Abraham. [17] Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people. Hebrews 2:16-17 For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life. Romans 5:10 We life a life crucified with Christ... But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world. Galatians 6:14 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me. Galatians 2:20