Sep 13, Egyptian Lighting the Fire Ceremony for all departed souls
Sep 16, Greek Rites of Goddess Demeter
Sep 17, Hildegarde of Bingen Feast Day
Sep 19, Feast of Thoth, Egyptian scribe god

Sep 21, Nativity of Blessed Mary, Eastern Orthodox Church
Birthday of Athena, Greek Goddess of Wisdom also known as Sophia.  Both Athena and Sophia are goddesses of “Wisdom”, one Greek pagan, the other Judeo-Christian-Pagan.  Mother Mary was assigned their birthday which might be appropriate if she was not just an ordinary woman, but an incarnation of Goddess Sophia, come to the earth to birth a god-man.

Sep 22 or 23, Autumn Equinox, Mabon, Ishtar’s Day: This year Fall Equinox is September 22 at 10:29 P.M. Eastern Daylight Time

In Catholicism both mainstream and “underground”, the Fall Equinox always begins the forty day All Hallows season, which culminates with Halloween, All Saints Day and then All Souls Day (Oct. 31, Nov. 1, Nov. 2 respectively).  This forty day period is one of four such in the esoteric Church year.  The other three forty day periods are:  Spring Equinox  (Mar 20 or 21) to May Day, Dec. 25 to Candlemas (Feb 1 or 2) and of course, Lent.  Lent is the forty day period beginning on Ash Wednesday and ending on Easter Sunday every year.