Palm Sunday is a Christian holiday that falls on the Sunday before Easter. It commemorates Jesus' triumphal entry into Jerusalem, where he was greeted by crowds of people waving palm branches and laying them on the ground in front of him as a sign of honor and respect.
A procession refers to a group of people who move together in an organized manner, often for a religious or ceremonial purpose. In the context of Palm Sunday, this procession involves members of a church carrying palm branches and walking together in remembrance of Jesus' entry into Jerusalem.
This procession is at a Fraternity of Saint Peter (FSSP) parish. The FSSP is a group of traditionalist Catholic priests who promote the traditional Latin Mass and other traditional practices of the Catholic Church. They were founded in 1988 and live together in a community, with a strong devotion to the Pope and commitment to evangelization and pastoral ministry.