I have looked at several liturgical calendars and I cacn find no concievable way that it was the feast of St Louis Marie de Montford. That priest must have been mistaken.

This is what Catholic World News says about August 2;
  Born in La Mure, France, Saint Peter became a parish priest in 1834 and joined the Marists five years later. He fostered Eucharistic adoration throughout his life and founded a religious order of priest-adorers of the Holy Eucharist who came to be known as the Priests of the Blessed Sacrament.

St. Eusebius was a Roman priest of the fourth century. According to the acts relating his martyrdom he was condemned by Constantius, the Arian Emperor, to be starved to death in a room in his own house. He was buried in the cemetery of St. Calixtus. His cult has always enjoyed special favor in Rome and his house was transformed into a church.

According to the 1962 Missal of Bl. John XXIII the Extraordinary Form of the Roman Rite, today is the feast of St. Alphonsus de Liguori. His feast in the Ordinary Form of the Roman Rite is now celebrated on August 1. It is also the commemoration of St. Stephen I, a Roman, who ruled the Church from 254 to 257 during the reign of the Emperor Valerian. He is famous for his correspondence with St. Cyprian about the validity of baptism administered by heretics. The pope's martyrdom was the beginning of Valerian's persecution.

Historically today is the feast of Our Lady of the Angels.

http://www.catholicculture.org/culture/liturgicalyear/calendar/day.cfm?date=2013-08-02