1. In 1861, the Salt Lake Tabernacle was dedicated by Brigham Young on October 21. The Tabernacle served as the location for weekly Mormon Church meetings and featured notable architecture designed by Henry Grow, including an elliptical shape and dome.

2. October 21, 1961 marks the debut of the Utah State University in Logan's Aggie Ice Cream. Today, Aggie Ice Cream is a popular treat for students, faculty, and visitors to the school.

3. On October 21, 1971, the first Zions Bank in Salt Lake City, Utah opened its doors. Zions Bank was founded in 1873 by Brigham Young, and has since grown to become one of the state's biggest banking institutions.

4. October 21, 2015 marked the 150th anniversary of the first Mormon Pioneer Company arriving at what is now called St. George, Utah. The commemoration honors the courage and determination of the early pioneers who played a crucial role in settling the American West.

5. In 2019, October 21 was declared "Equal Pay Day" in Salt Lake City, drawing attention to the gender wage gap and the need for equal pay for women in the workplace. The proclamation was made by Salt Lake City Mayor Jackie Biskupski.