The image regards a religious ceremony known as the Washing of Feet, which takes place on Holy Thursday as part of the Latin Mass. During this ceremony, the priest or bishop washes the feet of twelve people, symbolizing Jesus washing the feet of his disciples at the Last Supper.
The Latin Mass is a traditional form of Catholic worship that dates back to the early Church. It is characterized by the exclusive use of Latin in the liturgy, and follows a specific set of prayers and rituals.
Overall, the Washing of Feet on Holy Thursday is a significant moment in the Catholic Church's liturgical calendar, as it commemorates Jesus' act of humility and service towards his disciples.