Moses is one of the most recognizable people from the Old Testament, known for his role in the Exodus from Egypt and in receiving the Ten Commandments from God.
While he is not included in the universal calendar of the Roman Rite, he does have a day in the Roman Martyrology, which lists every saint that the Roman Church recognizes throughout the liturgical year.
The 2004 edition of the Roman Martyrology gives the following summary of Moses' life on September 4:
Commemoration of St. Moses, prophet, who was chosen by God to free the oppressed people from Egypt and lead them to the promised land; to him God also revealed himself on Mount Sinai, saying: “I am who am,” and gave the Law to guide the lives of the chosen people. This servant of God died on Mount Nebo in the land of Moab in front of the promised land.
The Catechism of the Catholic Church affirms this tradition of honoring the lives of Old Testament saints:
The patriarchs, prophets and certain other Old Testament figures have been and always will be honored as saints in all the Church’s liturgical traditions.
September 4 would be a perfect day to read the book of Exodus and to recall the remarkable role Moses had in salvation history.