United States Legal Federal Holidays

•  New Year's Day [January 1st every year]
• Martin Luther King Day [3rd Monday in Jan]
• President's Day / Washington's Birthday [3rd Monday in Feb]
• Memorial Day [last Monday in May]
• Independence Day [July 4 every year]
• Labor Day [1st Monday in Sept]
• Columbus Day [2nd Monday in Oct]
• Veterans' Day [November 11 every year]
• Thanksgiving Day [fourth Thursday in Nov]
• Christmas Day [December 25 every year]

Another U.S. Legal Federal Holiday follows the Presidential Elections:
• Inauguration Day [Jan 20 of each fourth year after 1965]

Other Holidays, Celebrations, Observances

• Groundhog Day [February 2 every year]
• Lincoln's Birthday [February 12 every year]
• St. Valentines Day [February 14 every year]
• Washington's Birthday (traditional) [February 22 every year]
• St. Patrick's Day [March 17 every year]
• April Fool's Day [April 1 every year]
• Easter Sunday
• Earth Day [April 22 every year]:
• Cinco de Mayo [May 5 every year]
• Mother's Day [2nd Sunday in May]
• Armed Forces Day [3rd Saturday in May]
• Flag Day [June 14 every year]:
•  Father's Day [3rd Sunday in June]
• Parents' Day [4th Sunday in July]
• Grandparents' Day [first Sunday after Labor Day]
• Citizenship Day [September 17 every year]
• Native American Day: 4th Friday in September, celebrated (observed) many different days
• Sweetest Day [3rd Saturday in Oct]
• Halloween [October 31 every year]
• Election Day [first Tuesday after first Monday in Nov]
• Dec: Chanukah/Hanukkah 
• Kwanzaa December 26 - Jan 1 [every year]:
• New Year's Eve December 31 [every year]