Today is Palm Sunday, the beginning of Holy Week on the Christian Calendar. This feast takes place the Sunday before Easter and commemorates Jesus’ entry into Jerusalem. The symbolism of Jesus arriving on a donkey is symbolic of coming in peace rather than on a steed as a soldier might do. While palms can be used for religious services held on this day, it is not always possible to have them. So in many places substitutes are used from other trees such as the olive, yew or other native trees. This lead to Palm Sunday sometimes referred to locally as Yew Sunday or Branch Sunday.
The feast is celebrated both in Western and Eastern churches though not at the same time due to different calendars (the West uses the Gregorian while Eastern Orthodox uses the Julian).