January 15: Martin Luther King Day commemorates the birth of Martin Luther King, Jr., the recipient of the 1964 Nobel Peace Prize and an activist for non-violent social change until his assassination in 1968.
January 21: World Religion Day, observed by those of the Baha'i faith to promote interfaith harmony and understanding. World Religion Day starts sundown of January 17.
January 27: The International Day of Commemoration to remember the victims of the Holocaust. The anniversary of the liberation of the Auschwitz death camp in 1945 and UN Holocaust Memorial Day.
February 1: National Freedom Day, which celebrates the signing of the 13th Amendment, which abolished slavery in 1865.
February 13: Maha Shivaratri, a Hindu holiday that honors Shiva, one of the Hindu deities.
February 19: President's Day, a federally recognized celebration in the United States of George Washington's birthday, as well as every president proceeding after Washington.
March 8: International Women's Day. First observed in 1911 in Germany, it has now become a major global celebration honoring women's economic, political, and social achievements.
March 13 - April 15: Deaf History Month. This observance celebrates key events in deaf history, including the founding of Gallaudet University and the American School for the Deaf.
March 17: St. Patrick's Day, a holiday started in Ireland to recognize St. Patrick, the patron saint of Ireland, who brought Christianity to the country in the early days of the faith.
March 31: International Transgender Day of Visibility, celebrated to bring awareness to transgender people and their identities as well as recognize those that helped fight for rights for transgender people.
April 2: World Autism Awareness Day, created to raise awareness of the developmental disorder around
April 22: Earth Day promotes peace and sustainability of planet Earth. Events are held globally to show support of environmental protection of the earth.
May 5: Cinco de Mayo, a Mexican holiday commemorating the Mexican army's 1862 victory over France at the Battle of Puebla during the Franco-Mexican War (1861-1867). This day celebrates Mexican culture and heritage, including parades and mariachi music performances.
May 15 (sunset)-June 15: Ramadan, an Islamic holiday marked by fasting, praise, prayer and devotion to Islam.
May 28: Memorial Day in the United States, a federal holiday established to honor military veterans who died in wars fought by American forces.
June 15: Eid-al-Fitr, the first day of the Islamic month of Shawwal, marking the end of Ramadan. Many Muslims attend communal prayers, listen to a khutba (sermon) and give zakat al-fitr (charity in the form of food) during Eid al-Fitr.
July 18: Nelson Mandela International Day, launched in recognition of Nelson Mandela's birthday on July 18, 2009 via unanimous decision of the UN General Assembly. It was inspired by a call Nelson Mandela made a year earlier, for the next generation to take on the burden of leadership in addressing the world's social injustices when he said "It is in your hands now". It is more than a celebration of "Madiba's" life and legacy. It is a global movement to honor his life's work and act to change the world for the better.
July 26: Disability Independence Day, celebrating the anniversary of the 1990 signing of the Americans with Disabilities Act.
August 21-25: Eid Al-Adha an Islamic festival to commemorate the willingness of Ibrahim (also known as Abraham) to follow Allah's (God's) command to sacrifice his son Ishmael. Muslims around the world observe this event.
August 26: Women's Equality Day, which commemorates the August 26, 1920 certification of the 19th Amendment to the United States Constitution that gave women the right to vote. Congresswoman Bella Abzug first introduced a proclamation for Women's Equality Day in 1971. Since that time, every president has published a proclamation recognizing August 26 as Women's Equality Day.
September 3: Labor Day in the United States. Labor Day honors the contribution that laborers have made to the country and is observed on the first Monday of September.
September 9-11: Rosh-Hashanah, the Jewish New Year celebration, marking the creation of the world.
September 11: The Ethiopian New Year. Rastafarians celebrate the New Year on this date and believe that Ethiopia is their spiritual home.
September 15 - October 15: Hispanic Heritage Month. This month corresponds with Mexican Independence Day,which is celebrated on September 16, and recognizes the revolution in 1810 that ended Spanish dictatorship.
November 11: Veterans Day, a U.S. federal holiday honoring military veterans. The date is also celebrated as Armistice Day or Remembrance Day in other parts of the world and commemorates the ending of the first World War in 1918.
November 22: Thanksgiving in the United States.
December 1: World AIDS Day, commemorating those who have died of AIDS, and to acknowledge the need for a continued commitment to all those affected by the HIV/AIDS epidemic.
December 2-10: Hanukkah, a Jewish holiday that is celebrated around the world for eight days and nights. Hanukkah celebrates the victory of the Maccabees or Israelites over the Greek-Syrian ruler, Antiochus about 2200 years ago.
December 3: International Day of Disabled Persons, designed to raise awareness in regards to persons with disabilities in order to improve their lives and provide them with equal opportunity.
December 10: International Human Rights Day, established by the United Nations in 1948 to commemorate the anniversary of the Universal Declaration of Human Rights.