National Patriots' Day

Victoria Day; celebrated on Monday on or before May 24. (Canada), and its related observance:
National Patriots' Day or Journée nationale des patriotes (Quebec)

Public holidays in North Macedonia

Saints Cyril and Methodius Day (Eastern Orthodox Church, Julian Calendar) and its related observance:
Saints Cyril and Methodius, Slavonic Enlighteners' Day (North Macedonia)

Day of Slavonic Alphabet, Bulgarian Enlightenment and Culture

Saints Cyril and Methodius Day (Eastern Orthodox Church, Julian Calendar) and its related observance:
Bulgarian Education and Culture and Slavonic Literature Day (Bulgaria)

Lubiri

Lubiri Memorial Day (Buganda)

Public holidays in Belize

Commonwealth Day (Belize)

May 24 (Eastern Orthodox liturgics)

Christian feast day:
May 24 (Eastern Orthodox liturgics)

Vincent of Lérins

Christian feast day:
Vincent of Lérins

Simeon Stylites the Younger

Christian feast day:
Simeon Stylites the Younger

Saint Sarah

Christian feast day:
Sarah (celebrated by the Romani people of Camargue)

Mary, Help of Christians

Christian feast day:
Mary, Help of Christians

Beatification

Christian feast day:
Blessed Louis-Zéphirin Moreau

Juan de Prado

Christian feast day:
Juan de Prado

Joanna, wife of Chuza

Christian feast day:
Joanna

Jackson Kemper

Christian feast day:
Jackson Kemper (Episcopal Church)

Donatian and Rogatian

Christian feast day:
Donatian and Rogatian