May 27 (Western)

Prayer, Vigils, Fasting (pre-festival), Novenas, Retreats

Whit Monday or Pentecost Monday (also known as Monday of the Holy Spirit) is the holiday celebrated the day after Pentecost, a movable feast in the Christian calendar. It is movable because it is determined by the date of Easter.

Whit Monday gets its English name for following "Whitsun", the day that became one of the three baptismal seasons. The origin of the name "Whit Sunday" is generally attributed to the white garments formerly worn by those newly baptized on this feast.

Saints Cyril and Methodius (Greek: Κύριλλος καὶ Μεθόδιος, Old Church Slavonic: Кѷриллъ и Меѳодїи^[more]) were Byzantine Greek brothers born in Thessaloniki in the 9th century.^{[3][4][5][6][7][8][9][10]} They were Christian missionaries among the Slavic peoples of the First Bulgarian Empire, Great Moravia, and Pannonia. Through their work they influenced the cultural development of all Slavs, for which they received the title "Apostles to the Slavs". They are credited with devising the Glagolitic alphabet, the first alphabet used to transcribe Old Church Slavonic.^[11] After their deaths, their pupils continued their missionary work among other Slavs. Both brothers are venerated in the Orthodox Church as saints with the title of "equal-to-apostles". In 1880, Pope Leo XIII introduced their feast into the calendar of the Roman Catholic Church. In 1980, Pope John Paul II declared them co-patron saints of Europe, together with Benedict of Nursia.^[12]

The two brothers were born in Thessaloniki – Cyril in 827–828 and Methodius in 815–820. Cyril was reputedly the youngest of seven brothers; he was born Constantine,^[13] but took the name Cyril upon becoming a monk shortly before his death,^[14][15][16] according to the "Vita Cyrilli" ("The Life of Cyril"). Their father was Leo, a droungarios of the Byzantine theme of Thessaloniki, and their mother was Maria, who may have been a Slav.^[17]

Buddha's Birthday, the birthday of the Prince Siddhartha Gautama, is a holiday traditionally celebrated in Mahayana Buddhism.

In all east Asian countries, except Japan beginning in 1873, it is held on the 8th day of the 4th month in the Chinese lunar calendar, and the day is an official holiday in Hong Kong, Macau, and South Korea. The date varies from year to year in the Gregorian calendar:

The festival of  Shavuot (help·info) (or  Shavuos (help·info), in Ashkenazi usage; Shabhuʿoth in Classical and Mizrahi Hebrew Hebrew: שבועות‎, lit. "Weeks") is a Jewish holiday that occurs on the sixth day of the Hebrew month of Sivan (late May or early June).

Shavuot commemorates the anniversary of the day God gave the Torah to the entire Israelite nation assembled at Mount Sinai, although the association between the giving of the Torah (Matan Torah) and Shavuot is not explicit in the Biblical text. The holiday is one of the Shalosh Regalim, the three Biblical pilgrimage festivals. It marks the conclusion of the Counting of the Omer.