September is one of the busier months in the Vincentian Family Calendar. The Vincentian Encyclopedia has background on these events.

2 – Bl. Louis-Joseph Francois,  Jean-Henri Gruyer and Pierre-Rene Rogue, Priests and Martyrs,
7 – Frank Duff joined the Society of Saint Vincent de Paul 1913 (founds the Legion of Mary -1921)
8 – Death of Frederic Ozanam – 1853
9 – Feast of Blessed Frederic Ozanam
9 – Birth of Sr. Rosalie Rendu, DC – 1786
10 – St. John Gabriel Perboyre, C.M.Priest and Martyr – +1840
11-14 – Society of St. Vincent de Paul National Meeting
11 – Founding of St. Elizabeth College, [Convent Station] NJ – 1899
14 – Elizabeth Ann Seton, first native-born saint of the United States, is canonized by Pope Paul VI. – 1975
20-22 – Ladies of Charity USA Annual Assembly
23 – Vincent de Paul Ordained a priest – 1600
27 – Feast of Vincent de Paul
For more events see the Vincentian Calendar on Famvin