Martin Luther King Jr. Day is significant as a federal holiday commemorating Dr. King's legacy of civil rights, nonviolence, and service, as well as a national call-to-action for community service, reflection on ongoing inequalities, and recommitment to justice, equality, and the "Beloved Community" he envisioned. It's a "Day On, Not a Day Off," encouraging Americans to volunteer and address long-standing concerns such as racial and economic inequality, carrying on the Civil Rights Movement's unfinished work.