....which our Synod at present seems to be ignoring! Nevertheless, if you check out the 1731 Lutheran Almanac that the good deacon has posted on the Net (www.lexorandi.org then go to Calendars), you'll see September 8th commemorating this day. But how long into Lutheranism did this day persist? Well, if I pull out my handy-dandy Die Bibel order die ganze Heilige Schrift Alten und Neues Testaments which CPH published into the 20th century, and look in the back where it gives assigned lectionary readings, we discover:
Am Tage der Geburt Mariä - on the Day of the Birth of Mary.
Oh, and to add insult to injury, we note that our Lutheran fathers included as the Epistle reading on said day:
When they said "ganze," they were not joking!
The Gospel for the day is the geneology of our Lord from St. Matthew: Matthew 1:1-16.
Where, oh, where did the observance of Mary's Birthday go - not merely as a commemoration, but as a celebration with Eucharistic propers?
Sadly, you won't find it in Treasury of Daily Prayer because of the (laudable) commitment to completely reflect the LSB appointed propers and rubrics. BUT you will find it in The Brotherhood Prayer Book, where in addition to the readings given above, the following collect is supplied:
Grant, O Lord, we beseech Thee, unto Thy servants the gift of Thy heavenly grace that as the child-bearing of the blessed virgin Mary was the beginning of salvation, so the joyful festival of her nativity may bring us an increase of peace; through Jesus Christ, Thy Son, our Lord...
Here's the lovely hymn Quem terra, pontus sidera by Fortunatus, sung by Pr. Mayes. Fitting for this day: