September 2023
National Hispanic Heritage Month
National Suicide Prevention Month
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| 1 | World Day of Prayer for the Care of Creation |
 | Season of Creation begins and lasts through 10/4 |
| 3 | Feast of Phoebe: First deacon in the Church |
| Feast of St. Gregory the Great, Born during the Byzantine Empire-604: Patron of teachers, students, and musicians |
| 4 | Labor Day |
| 6 | Birthday of Jane Addams, 1860–1935: Known as the "mother" of social work, a pioneer American settlement activist, and leader in women’s suffrage and world peace. |
| Rosh Hashanah begins at sunset and ends at nightfall 9/8 |
| 8 | Feast of the Birth of the Blessed Virgin Mary |
| National Grandparents Day |
| Birthday of Kerry Kennedy, 1959: Human rights activist, president of the Robert F. Kennedy Center for Justice and Human Rights, founder of global education initiative "Speak Truth to Power" |
| 10 | World Suicide Prevention Day |
| Anniversary of the terrorists attacks on U.S. |
| 12 | Anniversary of the assassination of Stephen Bantu Boko, 1946–1977: Anti-apartheid activist in South Africa during the 1960s and 1970s |
| Birthday of Florence Kelley, 1859–1932: A leading organizer against sweatshops and an advocate for children's rights |
| 13 | Birthday of Marie Dennis, 1942: Former co-president of Pax Christi international, currently senior director of the Catholic Nonviolence Initiative, and prolific author |
| 15 | Feast of Our Mother of Sorrows |
| Hispanic Heritage Month begins and lasts through 10/15 |
| Birthday of Alfred Depp, SJ, 1907–1945: German priest and philosopher; key figure in the resistance to Nazism |
| International Day of Democracy |
| 16 | International Day for the Preservation of the Ozone Layer |
| Anniversary of the assassination of Victor Lidio Jara Martínez, 1932–1973: Chilean teacher, theatre director, poet, singer-song writer, and political activist |
| 17 | Constitution Day |
| Clean Up the World Weekend |
| 19 | Birthday of Paulo Freire, 1921–1997: Brazilian educator and philosopher; creator of the pedagogy of the oppressed |
| 20 | Birthday of Van Jones, 1968: Civil rights activists, attorney, and social and environmental justice leader |
| Sukkot (Jewish Feast of Tabernacles) begins at sunset and ends on 9/27 |
| 21 | International Day of Peace |
| Anniversary of the assassination of Chilean diplomat Orlando Letelier in Washington, DC and his American colleague, Ronnie Karpen Moffitt, 1976 |
| 22 | Birthday of Hans Scholl, 1918–1943: Founding member of the White Rose resistance movement in Nazi Germany |
| World Car Fee Day |
| 24-25 | Yom Kippur |
| 25 | United Nations General Assembly Adoption of Sustainable Development Goals |
| 26 | Feast of Blessed Pope Paul VI, 1897-1987: Continued the Second Vatican Council and implemented its numerous reforms |
| First televised U.S. presidential debate (Kennedy v. Nixon, 1960) |
| 27 | Feast of St. Vincent de Paul, 1581-1660: French catholic priest devoted to the poor; founded the Vincentian priests; patron of charities, hospitals, prisoners and volunteers |
| 28 | Feast of St. Lorenzo Ruiz, 1594-1637: First Filipino saint and patron of the Philippines |
| 29 | World Day of Migrants and Refugees |
| Birthday of Mother Catherine Elizabeth McAuley, 1778–1841: Foundress of the Sisters of Mercy |
| Michaelmas Day |
| Feast of the Archangels Michael, Gabriel and Raphael |
| International Coffee Day |
| 30 | Birthday of Elie Wiesel, 1928–2016: Author, professor, activist, Nobel Laureate and Holocaust survivor |
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