In addition to the biblical Sabbath day, Jesus observed the biblical
festivals recorded in the Old Testament; the Gospels do not show Him
ever being accused of violating the Holy Day observances. John 7 records
Him teaching at the temple during the Feast of Tabernacles. All four
Gospels record His actions leading up to and during His last Passover
with His disciples the night before He was crucified.
The Church that He founded was started on the Feast of Pentecost (Acts 2:1-4). After His death and resurrection the apostles continued to keep
these biblical feasts (Acts 18:21; 20:6; 1 Corinthians 5:6-8; 16:8).
Since Jesus, the apostles and the early Church observed these biblical
festivals, why don't churches today keep them and teach about them?
Instead they have substituted other holidays for the Holy Days of the
Bible.
If Jesus had wanted His Church to observe festivals different from
those that He observed, shouldn't He have left this instruction? He
was clear and emphatic in His instructions to His disciples. It's hard
to imagine that Jesus would have set an example of observing the biblical
Sabbath and festivals but later led or inspired His Church to dismiss
them and replace them with alternate observances that originated in
paganism.
