The feasts were still kept after Yahushua’s crucification:
18 So Paul still remained a good while. Then he took leave of the brethren and sailed for Syria, and Priscilla and Aquila were with him. He had his hair cut off at Cenchrea, for he had taken a vow. 19 And he came to Ephesus, and left them there; but he himself entered the synagogue and reasoned with the Jews. 20 When they asked him to stay a longer time with them, he did not consent, 21 but took leave of them, saying, “I must by all means keep this coming feast in Jerusalem; but I will return again to you, YHWH willing.” And he sailed from Ephesus.
9 Now when much time had been spent, and sailing was now dangerous because the Fast was already over, Paul advised them, 10 saying, “Men, I perceive that this voyage will end with disaster and much loss, not only of the cargo and ship, but also our lives.”
1 Corinthians 5:7-8
7 Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us. 8 Therefore let us keep the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.