Name a holiday that celebrates the legacy of Martin Luther King, Jr.

The holiday that celebrates the legacy of Martin Luther King, Jr. is Martin Luther King, Jr. Day. This federal holiday is observed on the third Monday of January each year, close to the birthday of Dr. King, which is January 15. The purpose of the holiday is to honor his contributions to the civil rights movement and his advocacy for nonviolent activism in the pursuit of equality and justice. It serves as a reminder of the ongoing struggle against racial inequality and is often marked by community service events, educational programs, and reflections on Dr. King's vision of a racially integrated and harmonious society.

Other holidays mentioned, such as Thanksgiving and Independence Day, are significant in their own right but do not specifically commemorate Dr. King or his impact on American history and civil rights. Labor Day celebrates the labor movement and workers’ contributions, not Dr. King's legacy. Thus, Martin Luther King, Jr. Day stands out as a dedicated observance of his life and achievements.