Although denominational scholars agree that the word Easter mentioned in Acts 12:4 was mistranslated and should actually be translated as Passover (Pesach), it is still regarded as the day of the Resurrection because of the change made by the Catholic Church late in the 2nd Century.
The Disciples of Yeshua did not celebrate a resurrection. In fact, Yeshua’s Disciples and the First and Second Century Messianic Congregations were celebrating Passover (Pesach), Unleavened Bread, and Firstfruits.