White Sunday
White Sunday is held on April 27. It falls on the next Sunday after Easter. This event in the third decade of the month April is annual. 
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In the Middle Ages, Invocabit Sunday, the first Sunday in Lent, was referred to as "White Sunday" because in Rome, candidates for baptism who wanted to be baptized on the Easter Vigil went to church in white baptismal robes for the first time on this Sunday and took part in the service.
In the Protestant liturgy, the Sunday is referred to as Quasimodogeniti (Like newborn children) after the first words of the Introit Quasi modo geniti infantes (Like newborn children); the Introit takes up the motif of the rebirth of the Christian through baptism.
Holy Saturday on April 19
Whit Monday according to Eastern Christian tradition on June 9
Feast of the Holy Trinity on June 15
St. Bartholomew's Day in the Catholic and Protestant churches on August 24
World Day of Prayer for the Care of Creation on September 1
Beginning of the Orthodox Church Year on September 1
Nativity of the Virgin Mary on September 8