The Bible contains no record of the New Testament Church observing Easter or Lent during the time of the apostles, nor does it contain any direction for their observance.
For people who observe Easter it might come as a surprise to learn that Paul, the Apostle sent to the Gentiles, gave instructions to a mostly Gentile church in Corinth to keep festivals generally regarded as Jewish and not for Christians.
Many aspects of traditional Christianity, including holidays and doctrines, have their origins in ancient pagan religious practices instead of the Bible.