COMMEMORATION OF ALL SAINTS OF NORTH AMERICA & FIRST SUNDAY AFTER TRINITY
It is regular practice in most Orthodox Churches to remember the saints native to or who served in their lands, on the second Sunday after Pentecost, which according to Old English rendering is the first Sunday after the Feast of the Holy Trinity.
Troparion — Tone 8As the bountiful harvest of Your sowing of salvation, / The lands of North America offer to You, O Lord, all the saints who have shone in them. / By their prayers keep the Church and our land in abiding peace / Through the Theotokos, O most Merciful One.
From the OCA website where you will also find a brief synopsis of the events in their lives.
Kontakion — Tone 3Today the choir of Saints who were pleasing to God in the lands of North America / Now stands before us in the Church and invisibly prays to God for us. / With them the angels glorify Him, / And all the saints of the Church of Christ keep festival with them; / And together they all pray for us to the Pre-Eternal God.
Holy hierarchs, venerable monastics and glorious martyrs,
pious men, women and children, both known and unknown.
Through their words and deeds in various walks of life,
by the grace of the Spirit they achieved true holiness.
As they now stand in the presence of Christ who glorified them,
they pray for us who celebrate their memory in love.
Come, let us assemble today,
and glorify the luminaries of the North American lands,
the glorious martyrs and holy bishops who confirmed our Faith,
the righteous dwellers in the wilderness,
and guides of the spiritual life.
Let us cry out to them in joy:
O All Saints of North America, known and unknown, pray to God for us.
As the brightest sun, as the brilliance of the morning star,
the precious feast of the Saints of North America has dawned for us,
to illumine us and to set our hearts on fire,
to imitate their godly lives,
and to follow their example of zeal for God.
Come let us assemble today,
and let us praise the elect of North America.
Having fought the good fight you have persevered in the Faith,
receiving your crowns of victory from God.
Beseech Him to deliver from every calamity and sorrow,
all who keep your holy memory in faith and love.
The principle observance for June 22 is the First Sunday after Trinity, according to the Sarum Missal.