I've always appreciated God's message for us in Acts. It's not invariably presented the way He intended though. There's a distinction drawn between Gentiles and other believers and to avoid cognitive dissonance among Jewish believers, once their unbelieving fellows had rejected Christ, the uniquely Jewish conventions were not suddenly applied to Gentiles – although obviously it's necessary to understand why Jesus had to die as a Son Of David to set us free. Otherwise it could be suggested that if a human sacrifice were needed and God needed to do the impregnating, why couldn't He just have gotten Eve pregnant and murdered that baby after a few decades? Because no such progeny could be a Son Of David! So we'd need to know that and the requirements making it essential for God in accordance with His Just Law and the words of the prophets. In Acts that distinction is preserved for us.
Herod was busy chopping people up, detached body parts seeming to be his speciality, much appreciated when chopping Christians – regardless of nationality. Two calendric highlights are mentioned for two distinct groups of people. For one group, a Jewish festival. For the other, a celebration that neither was nor is Jewish. See if you can spot them.
Acts 12:1-3, 4-5 Now about that time Herod the king stretched forth his hands to vex certain of the church. And he killed James the brother of John with the sword. And because he saw it pleased the Jews, he proceeded further to take Peter also. (Then were the days of unleavened bread.) And when he had apprehended him, he put him in prison, and delivered him to four quaternions of soldiers to keep him; intending after Easter to bring him forth to the people. Peter therefore was kept in prison: but prayer was made without ceasing of the church unto God for him.
The time of bringing Peter forth to the people is explained in terms all Christians understood, whatever their roots, rather than being dated according to a commemoration that may well have been alien to them. Peter's incarceration was timed to irritate Christians.
For chopping activities, on the other hand, a different group is being buttered up and a timeline of particular meaning to them is cited. Hint: it's not Easter. Altogether then a particularly obnoxious goose this Herod and God dealt with him appropriately. Spontaneous eruption into worms is rare and required some provocation in this case, even beyond incarcerating Peter as an Easter gesture. That turned out to be futile: God sent an angel to release him. But Herod was on a roll, decided to murder all the soldiers, proceeded to play God and worms it was. Check out the blue highlighted word:
Acts 12:18-19, 21-23 And when Herod had sought for [Peter] and found him not, he examined the keepers, and commanded that they should be put to death. And he went down from Judaea to Caesarea, and there abode ... And upon a set day Herod, arrayed in royal apparel, sat upon his throne, and made an oration unto them. And the people gave a shout, saying, It is the voice of a god, and not of a man. And immediately the angel of the Lord smote him, because he gave not God the glory: and he was eaten of worms, and gave up the ghost.