It was first proposed four days after King’s 1968 assassination outside a Memphis motel. It took 15 years until it became a federal holiday.

The organizations and museums celebrating MLK Day through concerts, exhibits, and volunteer opportunities in Philadelphia.

Monday is Martin Luther King Jr. Day, a federal holiday in the U.S. observed on the third Monday of January each year. The holiday was established in 1983, about 20 years after King’s “I Have a Dream” speech,