Information on religious, ethnic, and cultural celebrations:

Religious holidays of the world: https://study.soas.ac.uk/religious-holidays-of-the-world/

Religious Holidays 101: Quick-start Guide to Learning about Holidays Beyond Christmas by Emily Hamer

https://news.wisc.edu/religious-holidays-101-quick-start-guide-to-learning-about-holidays-beyond-christmas/

Ethnic Celebrations

https://www.georgiaencyclopedia.org/articles/arts-culture/ethnic-celebrations/

Cultural Holidays & Heritage Celebrations

Intercultural Student Affairs by Emerson College

https://emerson.edu/departments/intercultural-student-affairs/resources/cultural-holidays-heritage-celebrations

American Holidays > Ethnic & Religious Observances by U.S. Diplomatic Mission to Germany 

https://usa.usembassy.de/holidays-ethnic.htm

Videos: 

Video:  Northern city celebrates interfaith 'Holiday of Holidays'

https://youtu.be/Hu9IVrmloK4

Video:  Most Celebrated Holidays

https://youtu.be/n7ZLZjjDEGo

Video:  Diwali - Festival of Lights | National Geographic

https://youtu.be/HrrW3rO51ak

Video:  Winter Celebrations Around the World

https://youtu.be/V8L4LjqOKmE

The New York Times has a related article “A Look Inside New York’s Swirling Kaleidoscope of Faiths”

https://www.nytimes.com/2022/12/15/nyregion/world-religions-new-york-city.html?smid=nytcore-ios-share&referringSource=articleShare