Heathen holidays

Remembrance for Herman the Cheruscan (The Troth)

Martyrs' Day (Afghanistan)

Martyrs' Day (Afghanistan) (date may fall on September 8, follows a non-Gregorian calendar, see List of observances set by the Solar Hijri calendar)

International Buy-A-Priest-A-Beer Day

International Buy-a-Priest-a-Beer Day

Emergency Services Day (United Kingdom)

Emergency Services Day (United Kingdom)

Remembrance days in Slovakia

Day of the Victims of Holocaust and of Racial Violence (Slovakia)

Chrysanthemum Day

Chrysanthemum Day or Kiku no Sekku (Japan)

Children's Day

Children's Day (Costa Rica)

California Statehood Act

California Admission Day (California, United States)

Armed Forces of Ukraine

Armored Forces Day (Ukraine)

September 9 (Eastern Orthodox liturgics)

Christian feast day:
September 9 (Eastern Orthodox liturgics)

Joachim

Christian feast day:
Synaxis of Ss. Joachim and Anna, an Afterfeast. (Eastern Orthodox and Eastern Catholic Churches)

Peter Claver

Christian feast day:
Peter Claver

Sanctuary of Arantzazu

Christian feast day:
Our Lady of Arantzazu (Oñati)

St. Mary's Episcopal Cathedral (Memphis, Tennessee)

Christian feast day:
Constance, Nun, and her Companions (Episcopal Church)

Frédéric Ozanam

Christian feast day:
Frédéric Ozanam