The feast of the Transfiguration may be observed on Sunday 6 August or Monday 7 August.
If it is observed on Monday 7 August:

The Transfiguration of Our Lord

https://almanac.oremus.org/2023-08-07

White

Principal Service
Daniel 7.9,10,13,14
Psalm 97
2 Peter 1.16-19
Luke 9.28-36

Third Service
Ecclesiasticus 48.1-10 or
1 Kings 19.1-16
1 John 3.1-3
Morning Psalms
Psalms 27, 150

Second Service
Exodus 34.29-35
2 Corinthians 3
Evening Psalm
Psalm 72