The Festival of the Blessed Virgin Mary may be observed on 8 September instead of 15 August. If it is observed on 8 September then the material for 15 August replaces the material for Trinity 12.
The Twelfth Sunday after Trinity
Sunday between 4 and 10 September inclusive
Psalms 122, 123
Jonah 3.10 – 4.11 or
Ecclesiasticus 27.30 – 28.9
Psalms  121
Isaiah 43.14 – 44.5
Almighty and everlasting God, who art always more ready to hear than we to pray, and art wont to give more than either we desire or deserve; Pour down upon us the abundance of thy mercy; forgiving us those things whereof our conscience is afraid, and giving us those good things which we are not worthy to ask, but through the merits and mediation of Jesus Christ, thy Son, our Lord.