Roald Dahl

Roald Dahl Day (Africa, United Kingdom, Latin America)

Engineer's Day

Engineer's Day (Mauritius)

Niños Héroes

Día de los Niños Héroes (Mexico)

Programmer's Day

Day of the Programmer, during a non-leap year. (Russia)

September 13 (Eastern Orthodox liturgics)

Christian feast day:
September 13 (Eastern Orthodox liturgics)

Wulfthryth of Wilton

Christian feast day:
Wulfthryth (Wilfrida) of Wilton

Venerius the Hermit

Christian feast day:
Venerius the Hermit

Nectarius of Autun

Christian feast day:
Nectarius of Autun

Maurilius of Angers

Christian feast day:
Maurilius (Maurille) of Angers

Marcellinus of Carthage

Christian feast day:
Marcellinus of Carthage

John Chrysostom

Christian feast day:
John Chrysostom

Eulogius of Alexandria

Christian feast day:
Eulogius of Alexandria

Amatus

Christian feast day:
Amé (Amatus) of Remiremont

Saint Aimé

Christian feast day:
Aimé (Amatus)

Feast of the Cross

Christian feast day:
Feast of the Cross (Assyrian Church of the East)