Dear Viktor,
I have the same breviary as yours, so you will find the instructions for Solemnities, Feasts, and Memorials in the very front of your book. As Tee mentioned, there are three obligatory Memorials, but the only “proper” part is the concluding prayer.
When there is a Proper of Seasons, such as we are celebrating now for Christmas, this takes precedence during weekdays. In other words, you will not be using the *Common of Saints *for these Memorials, but rather the section for January 2 - Epiphany, as I explained previously.
Even if there is a Memorial during *Ordinary Time, *only the concluding prayer is “proper” and one does not need to use the Common of Saints, but may pray the regular weekday psalter.
With Feasts and Solemnities, however, we are to use the assigned readings.
I hope we have not confused you. The calendar link from “Tee_eff_em” is useful for the priests who use the Sacramentary, but it does not instruct us about the breviary, other than to allude on page 4 that the Proper of Seasons is to be used, “even on days which a memorial or optional memorial of a saint occurs.”
Carole