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The MLK Day of Service is the only federal holiday observed as a national day of service. The logo used by all states this.
What is "day on, not a day off."?
Rev. Dr. Martin Luther King, Jr. Day of Service Logo
a "day on, not a day off." . The MLK Day of Service is a part of United We Serve, the President's national call to service initiative. It calls for Americans from all walks of life to work together to provide solutions to our most pressing national problems. The MLK Day of Service empowers individuals, strengthens communities, bridges barriers, creates solutions to social problems, and moves us closer to Dr. King's vision of a "Beloved Community."