Accordingly, you will need to make full use of the ribbons in your Diurnal or other Office book!
Advent days between December 17 and 23 - where to put your ribbons
During this period, the other texts can come from several different sources each day, so I strongly recommend following the Ordo very closely (alternatively, particularly if you are new to the Office, rather than trying to say it all yourself, listen and absorb the Office being sung by the monks of Le Barroux!).
If you are going to say the Office this week, I would suggest deploying your ribbons as follows:
(1) The Ordinary of Advent: The Ordinary of Advent continues to be used each day, with a change of invitatory antiphon for those saying Matins, those set for the Advent day, the particular date, or (most often) a mix of the above.
(2) The psalms for the particular hour you are saying - the normal daily psalms continue to be used, except on Thursday when festal psalms for the feast of St Thomas are used instead at Matins, Lauds and Vespers.
(3) The antiphons for the day of the week between December 17 and 23 (from Monday).
(4) The day within the Third Week of Advent, for the canticle antiphon of Lauds and the collects (Wednesday, Friday and Saturday are Ember Days, with their own collects). Note though that the Vespers canticles set out there are not used, and December 21 and 23 have particular antiphons at Lauds that displace those of the Advent day.
You can find more details on the rubrics for this more intense period of Advent here.
Saturday Vespers on 23 December
Because Christmas is on Monday this year, next Sunday is the Vigil of Christmas rather than the Fourth Sunday of Advent. But the texts for the Fourth Sunday are still used in the Office at I Vespers on Saturday December 23 (ie the Vigil is literally just the Sunday).
Key to the abbreviations:
MD= Monastic Diurnal (MD, 2004 onwards editions)
AM =Antiphonale Monasticum 1934 (1995 edition).
LR=Liber Responsorialis (downloadable from CC Watershed)
LH=Liber Hymnarius, Solesmes, 1983
Matins: Invitatory for Third Sunday of Advent onwards (Prope est, LH 10 or NR lv), hymn Verbum supernum; antiphons of Advent; readings and responsories for the Third Sunday
Matins: Ordinary of Advent (Invitatory Prope est, hymn, versicles and chapter) with three readings