The Christian festival whose date was fixed in 325 AD by the Council of Nicaea is Easter. This important holiday celebrates the resurrection of Jesus Christ from the dead, which is a central event in the Christian faith.

The Council of Nicaea was a gathering of Christian bishops convened by the Roman Emperor Constantine I in the city of Nicaea (modern-day Iznik, Turkey). One of the main purposes of the council was to resolve the controversy surrounding the date of Easter.

Prior to the Council of Nicaea, different Christian communities celebrated Easter on different dates, leading to confusion and division within the church. Some followed the Jewish calendar and celebrated Easter on the same date as Passover, while others believed Easter should always be celebrated on a Sunday.

At the Council of Nicaea, it was decided that Easter would be celebrated on the first Sunday following the full moon after the vernal equinox. This formula is still used to calculate the date of Easter to this day, ensuring that Christians around the world celebrate this important holiday on the same day.

By fixing the date of Easter, the Council of Nicaea sought to bring unity and consistency to the Christian church. The decision was not only a practical one but also had theological significance, as Easter is a symbol of new life and hope for Christians.

Today, Easter is celebrated with various traditions and customs, including attending church services, participating in egg hunts, and sharing festive meals with family and friends. It is a time of joy and reflection for Christians as they commemorate the resurrection of Jesus Christ.

In conclusion, the Council of Nicaea played a crucial role in establishing the date of Easter and ensuring its observance across the Christian world. This decision has had a lasting impact on the church and continues to be a central part of Christian worship and tradition.

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