For a Muslim it is not permissible to be a part of any festival or innovated celebration that is not part of Islam and are the ways of Kuffar. Easter is one such festival and a believer must refrain from celebrating it. It is because taking part and attending it is helping in this evil, and increasing their numbers, and imitating them, all of which is not allowed. Allaah says (interpretation of the meaning):
“Help you one another in Al‑Birr and At‑Taqwa (virtue, righteousness and piety); but do not help one another in sin and transgression. And fear Allaah. Verily, Allaah is Severe in punishment”
And the Prophet (peace and blessings of Allaah be upon him) said: “Whoever imitates a people is one of them.” Narrated by Abu Dawood (4031); classed as saheeh by al-Albaani in Irwa’ al-Ghaleel (5/109).
It is not permissible for the Muslims to attend the festivals of the mushrikeen, according to the consensus of the scholars whose words carry weight. The fuqaha’ who follow the four schools of thought have stated this clearly in their books… Al-Bayhaqi narrated with a saheeh isnaad from ‘Umar ibn al-Khattaab that he said: “Do not enter upon the mushrikeen in their churches on the day of their festival, for divine wrath is descending upon them.” And ‘Umar also said: “Avoid the enemies of Allaah on their festivals.” Al-Bayhaqi narrated with a jayyid isnaad from ‘Abd-Allaah ibn ‘Amr that he said: “Whoever settles in the land of the non-Arabs and celebrates their new year and festival and imitates them until he dies in that state, will be gathered with them on the Day of Resurrection.” (Ahkaam Ahl al-Dhimmah, 1/723-724)
And Allaah is the Source of strength. Therefore It is not permissible for a Muslim to celebrate or participate in any festivals of kuffar or to participate in the weather by following their tradition or for mere entertainment because just celebrating it is a haraam innovation, but attending their religious rituals is more haraam.
The Muslim should spend this day like any other day, and not have any special food or drink on it, or do anything else to show happiness that is done by those who celebrate this festival, such as going out to parks, funfairs and so on, so as to disavow himself of the sins of approving or taking part.
And Allaah knows best.