In 1981, the United Nations General Assembly recognized September 21 as the International Day of Peace.

California celebrates Native American Day each year on the fourth Friday of September.

Manufacturing Day is held annually on the first Friday in October.

German-American Day is a holiday in the United States, observed annually on October 6.

National Coming Out Day is an annual LGBTQ+ awareness day observed on October 11.

Indigenous Peoples' Day is celebrated annually on the second Monday of October.

United Nations Day is an annual commemorative day, reflecting the official creation of the United Nations on October 24, 1945.

Halloween, a contraction of All Hallows' Eve, is a holiday observed on October 31, the evening before All Saints' (or All Hallows') Day.

The first week of November is National School Psychology Week.