I believe that the Bible says that Jesus has fulfilled Passover and the Feast of Unleavened Bread.
The next feast is Firstfruits.
This one takes place on the day after the Sabbath after Passover, which will be the first day of the week.
‘These are the feasts of the LORD, holy convocations which you shall proclaim at their appointed times. On the fourteenth day of the first month at twilight is the LORD’s Passover. And on the fifteenth day of the same month is the Feast of Unleavened Bread to the LORD; seven days you must eat unleavened bread. On the first day you shall have a holy convocation; you shall do no customary work on it. But you shall offer an offering made by fire to the LORD for seven days. The seventh day shall be a holy convocation; you shall do no customary work on it.'”
And the LORD spoke to Moses, saying, “Speak to the children of Israel, and say to them: ‘When you come into the land which I give to you, and reap its harvest, then you shall bring a sheaf of the firstfruits of your harvest to the priest. He shall wave the sheaf before the LORD, to be accepted on your behalf; on the day after the Sabbath the priest shall wave it. Lev 23:4-12
It is evident from what Paul said to the Corinthians that Jesus has also fulfilled this feast.
But now Christ is risen from the dead, and has become the firstfruits of those who have fallen asleep. 1 Cor 15:20
Now after the Sabbath, as the first day of the week began to dawn, Mary Magdalene and the other Mary came to see the tomb. Matt 28:1
But the angel answered and said to the women, “Do not be afraid, for I know that you seek Jesus who was crucified. He is not here; for He is risen, as He said. Come; see the place where the Lord lay. Matt 28:5-6
Jesus fulfilled this feast on the day after the Sabbath, which is the first day of the week by rising from the dead and becoming the firstfruits of the resurrection.