September 15 to October 15 – National Hispanic Heritage Month: This month honors Hispanic and Latino Americans for their contributions to U.S. culture.
September 15 to September 17 – Rosh Hashanah begins at sunset on September 15, and ends on Tuesday September 17 at sunset.
September – National Recovery Month: This awareness month seeks to educate Americans on treatment and health services for individuals with substance-use disorders.
September 20 – HeForShe: This movement was started by the UN with the goal of promoting gender equality
September 22 – Autumnal Equinox: This date marks a variety of religious observances across the globe
September 15 to September 17 – Rosh Hashanah: This holiday is the Jewish New Year and a reflection of their faith
Global Diversity Awareness Month: An awareness month with the goal of promoting respect towards various cultures.
National Disability Employment Awareness Month: This awareness month aims to advocate for individuals with disabilities and their inclusion in the workforce.
Breast Cancer Awareness Month: Breast cancer is a leading cause of death in women; this month seeks to boost awareness of the disease.
National Polish American Heritage Month: A month selected to honor those with Polish heritage.
October 10 – World Mental Health Day: A day that advocates for mental health awareness and education; on this day, you can support the efforts by reflecting on your own biases regarding mental health and advocating against social stigma related to it.
October 10 – Indigenous People’s Day: This day honors the Indigenous people of North America; the holiday was formerly called Columbus Day
October 14 – Defender of Ukraine Day: This day celebrates those who have fought for the freedom of Ukraine
October 17 – Spirit Day: This day is explicitly aimed at LGBTQ youth and what their community can do to support them. You can participate in this day by wearing purple and speaking out against bullying.
National American Heritage Month: This month celebrates the contributions — cultures, traditions, histories — of Native people to the United States
November 1 – All Saints’ Day, All Souls Day, Día de Los Muertos: These days are dedicated to all those who have passed away in the Christian faith as well as the Mexican and Aztec communities
November 16 – International Day for Tolerance: The UN holiday was founded to encourage respect among various people regardless of culture, language, religion, or ethnicity
November 12 – Diwali: An important celebration in the Hindu faith in which a variety of deities are praised
November 16 – Dutch American Heritage Day: This day applauds the long friendship between the Netherlands and the United States
November 20 – Transgender Day of Remembrance: This day is held as a remembrance for all those murdered because of transphobia
December 1 – World AIDS Day: This day highlights the importance of HIV/AIDs awareness and raises money for its cure.
December 3 – International Day of Persons with Disabilities: This United Nations holiday raises awareness of the rights of individuals with disabilities.
December 10 – International Human Rights Day: A holiday adopted by the UN in 1948 following the Universal Declaration of Human Rights.
December 16 to December 24 – Las Posadas: A religious festival celebrated in Mexico and parts of the U.S. during the Christmas season.
December 7 to December 15 – Hanukkah: A Jewish holiday celebrating the rising up against their Greek-Syrian oppressors in the Maccabean Revolt.
December 22 – Winter Solstice/Yule: A festival celebrated by the Pagan and Wiccan faiths.
December 25 – Christmas: A Christian holiday marking the birth of their lord and savior, Jesus Christ.
December 26 – Kwanzaa: An 8-day holiday often celebrated by Black Americans that was inspired by African harvest celebrations.