Praying the Mass and the Office of Readings is usually out of the picture, but there are exceptions:
98. Apart from Christmas eve, the combining of Mass with the office of readings is normally excluded, since the Mass already has its own cycle of readings, to be kept distinct from any other. But if by way of exception, it should be necessary to join the two, then immediately after the second reading from the office, with its responsory, the rest is omitted and the Mass begins with the Gloria, if it is called for; otherwise the Mass begins with the opening prayer.
99. If the office of readings comes immediately before another hour of the office, then the appropriate hymn for that hour may be sung at the beginning of the office of readings. At the end of the office of readings the prayer and conclusion are omitted and in the hour following the introductory verse with the Glory to the Father is omitted.