The month of September is dedicated to Our Lady of Sorrows, whose memorial the Church celebrates on September 15, the day after the feast of the Triumph of the Cross. 

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"The truth appears to be that all the mysteries of Jesus and Mary were in God's design as one mystery. Jesus Himself was Mary's sorrow, seven times repeated, aggravated sevenfold. During the hours of the Passion, the offering of Jesus and the offering of Mary were tied in one. They kept pace together; they were made of the same materials; they were perfumed with kindred fragrance; they were lighted with the same fire; they were offered with kindred dispositions. The two things were one simultaneous oblation, interwoven each moment through the thickly crowded mysteries of that dread time, unto the eternal Father, out of two sinless hearts, that were the hearts of Son and Mother, for the sins of a guilty world which fell on them contrary to their merits, but according to their own free will." -Faber, At the Foot of the Cross