September is Dedicated to Our Lady of Sorrows

Those seven sorrows are: 

The Circumcision and Prophecy of SimeonThe Flight into EgyptThe Loss of Jesus in the TempleThe Meeting of Jesus and Mary on the Way of the CrossThe CrucifixionThe Taking Down of the Body of Jesus from the CrossJesus is laid in the Tomb
These seven sorrows are often represented in art by a sword — or three or seven swords — piercing Mary’s heart. This relates to the prophecy of the old man Simeon we heard about at Candlemas, when, after Our Lady pesented the Child Jesus at the Temple, he told her, “Behold this Child is set for the fall, and for the resurrection of many in Israel, and for a sign which shall be contradicted; And thy own soul a sword shall pierce, that, out of many hearts, thoughts may be revealed.”

Customs

In preparation for this feast, many pray the Novena in Honor of the Dolors of the Blessed Virgin, starting on September 6 and ending on September 14, the eve of this Feast. For the feast itself, the Litany to Our Lady of Seven Sorrows would be perfect.