World Mosquito Day

World Mosquito Day

Public holidays in Hungary

Saint Stephen's Day (Hungary)

Revolution of the King and the People

Revolution of the King and the People (Morocco)

Manipuri Language Day

Meitei Language Day, also known as Manipuri Language Day, the day on which Meitei (Manipuri) was included in the scheduled languages' list and made one of the official languages of India.

Indian Akshay Urja Day

Indian Akshay Urja Day (India)

List of observances set by the Baháʼí calendar

Feast of Asmá’ (Baháʼí Faith, only if Baháʼí Naw-Rúz falls on March 21)

August 20 (Eastern Orthodox liturgics)

Christian feast day:
August 20 (Eastern Orthodox liturgics)

William Booth

Christian feast day:
William and Catherine Booth (Church of England)

Samuel

Christian feast day:
Samuel (prophet)

Philibert of Jumièges

Christian feast day:
Philibert of Jumièges

Oswine of Deira

Christian feast day:
Oswine of Deira

Maria De Mattias

Christian feast day:
Maria De Mattias

Heliodorus of Bet Zabdai

Christian feast day:
Heliodorus of Bet Zabdai

Beatification

Christian feast day:
Blessed Georg Häfner

Bernard of Clairvaux

Christian feast day:
Bernard of Clairvaux