Palm Sunday worship begins (weather permitting) at 9:45 a.m. with a fun and festive procession from the Decatur Post Office (520 W. Ponce), down Ponce, and ending at the Lee courtyard by DEAM where the Liturgy of the Palms begins at 10:30 a.m.
Palm Sunday (The Sunday of the Passion)
The Sunday before Easter at which Jesus’ triumphal entry into Jerusalem (Mt 21:1-11, Mk 11:1-11a, Lk 19:29-40) and Jesus’ Passion on the cross (Mt 26:36-27:66, Mk 14:32-15:47, Lk 22:39-23:56) are recalled. It is also known as the Sunday of the Passion. Palm Sunday is the first day of Holy Week. Red is the liturgical color for the day. The observance of Palm Sunday in Jerusalem was witnessed by the pilgrim Egeria in about 381-384. During this observance there was a procession of people down the Mount of Olives into Jerusalem. The people waved branches of palms or olive trees as they walked. They sang psalms, including Ps 118, and shouted the antiphon, “Blessed is he who comes in the name of the Lord!”
More at the Episcopal Dictionary of the Church.