As I belong to the Third Order of the Society of the Most Sorrowful Mother, which is connected to Fr. Chad Ripperger's new order and the Auxilium Christianorum, this is "our" day.
Here is a site and there is an email for more information at the bottom. The Doloran Fathers write this:
The priests of the nascent Society of the Most Sorrowful Mother, the
"Doloran Fathers," work in cooperation with our local bishop to provide
the assistance of the rites and prayers of our Holy Mother, the Church
to some of the most spiritually afflicted suffering souls, many unable
to find relief or deliverance from their affliction for years.
Characterized as semi-contemplative, a good deal of prayer is required
of the Doloran priests each day to support their challenging mission.
How does one "celebrate" such a feast day?
With great gratitude that Our Lady willed her own Son's suffering...
I had this holy card as a very young girl and I remember looking carefully at it. I do not know what happened to it. As our Sorrowful Mother, Mary is also the Mediatrix of All Grace and the Co-Redeptorix. I can hardly wait until the Church proclaims this title, which so many in the Church desire her to formally have.
http://www.dolorans.com/