Thanksgiving Day is a national holiday celebrated on various dates in Canada, the United States, some of the Caribbean islands, and Liberia. It began as a day of giving thanks and sacrifice for the blessing of the harvest and of the preceding year. Similarly named festival holidays occur in Germany and Japan. Wikipedia
Martin Luther King Jr. Day is an American federal holiday marking the birthday of Martin Luther King Jr. It is observed on the third Monday of January each year, which is around King’s birthday, January 15. The holiday is similar to holidays set under the Uniform Monday Holiday Act.Wikipedia
Washington’s Birthday is a United States federal holiday celebrated on the third Monday of February in honor of George Washington, the first President of the United States, who was born on February 22, 1732. Since the Uniform Federal Holidays Act of 1971, its observance can occur from February 15 to 21, inclusive. Wikipedia