The Thursday after Trinity Sunday may be observed as a Day of Thanksgiving for Holy Communion.

Day of Thanksgiving for the Institution of Holy Communion (Corpus Christi)

http://almanac.oremus.org/2017-06-15

White

Principal Service
Genesis 14.18-20
Psalm 116.10-17
1 Corinthians 11.23-26
John 6.51-58

Third Service
Deuteronomy 8.2-16
1 Corinthians 10.1-17
Morning Psalm
Psalm 147

Second Service
Proverbs 9.1-5
Luke 9.11-17
Evening Psalms
Psalms 23, 42, 43