Christians celebrate Palm Sunday today.

Palm Sunday is a moveable feast in the Christian calendar which falls on the Sunday before Easter. The feast commemorates an event reported by all four Canonical Gospels (:Mark 11:1-11, Matthew 21:1-11, Luke 19:28-44, and John 12:12-19) - the Triumphal Entry of Jesus into Jerusalem in the days before his Passion.

The difficulty of procuring palms for that day's ceremonies in unfavorable climates for palms led to the substitution of boughs of yew, willow or other native trees. The Sunday was often designated by the names of these trees, as Yew Sunday or by the general term Branch Sunday (the only French equivalent is (Dimanche des) Rameaux, 'branches sunday')...wikipedia