Like many aspects of piety, that would largely depend on the formation and instruction offered by the parish pastor. Commemorations are a relatively new aspect of Lutheran liturgical life. The Evangelical Lutheran Church in America first added Commemorations (as distinct from the Lesser Festivals) with the publication of the 1978 Lutheran Book of Worship. The Lutheran Church-Missouri Synod has only now added Commemorations with the 2006 Lutheran Service Book.
In 1980 Rev. Dr. Philip Pfatteicher published an excellent volume entitled "Festivals and Commorations" which includes a biographical sketch, an excerpt of the saint's writing (when available) and suggestions for hymns and prayer petitions. At the time of publication Phil served as a campus minister, a setting in which he could have some type of chapel service every day, and now he serves on the staff of the largest Lutheran church in Pittsburgh where there is a liturgy every weekday. Most clergy are not in such settings so Commemorations might be mentioned when they coincide with a Sunday or other regular liturgy, or might not, depending on their own piety.
This is the sort of quantum liturgical and devotional change that will require several generations before the results can be fully guaged.
My parents have an old "Red" hymnal at home, with many of the Saints days in them. My grandfather's worship book has most of those and a few more (don't know enough German to be sure on some of the names).
It wasn't that they weren't on the calendar, but that for a long time they were "forgotten".
Do you ask the saints for their intercession before Christ?