I don't mind showing you the fulfillment of the festivals in scripture.
Christ, the lamb of God, was slain on Passover. He laid dead during unleavened bread, which is called the bread of affliction.
Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us: Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth. 1 Corinthians 5:7-8
He was raised from the dead on firstfruits
But now Christ is risen from the dead, and become the firstfruits of them that slept. 1 Corinthians 15:20
The law of the old covenant was given on Mt Sinai on the day of Pentecost. The law of the new covenant was poured out on Pentecost fulfilling the type. 'Fully come' below means to fully fill completely
And when the day of Pentecost was fully come, they were all with one accord in one place. Acts 2:1
The day of atonement began to be fulfilled when Christ entered into the holiest place to make reconciliation for his people. We await his exit from the heavenly sanctuary at which point the fulfillment of the day of atonement will be complete
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 2:17
Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession. Hebrews 4:14
That leaves 2 festivals yet to be completed: Trumpets and Tabernacles