PATERSON Bishop Serratelli served as main celebrant and homilist of Mass on Palm Sunday April 14 in the Cathedral of St. John the Baptist here. Palm Sunday commemorates the entrance of Jesus into Jerusalem when palm branches were placed in his path, before his arrest on Holy Thursday and his crucifixion on Good Friday. It marks the beginning of Holy Week, the final week of Lent. The congregation receives and holds blessed palm branches to mark the observance.