Thanksgiving Day is one of the most important holidays in the United States. It was established as a federal holiday in 1863 and has been celebrated every year since then. Thanksgiving is observed on the fourth Thursday in November.
Unthanksgiving Day, also known as the Indigenous Peoples Sunrise Ceremony, is an annual event that takes place on Alcatraz Island on the fourth Thursday in November, coinciding with Thanksgiving. It is designed to honor Native Americans and promote their rights.
Evolution Day is an annual celebration designed to commemorate the anniversary of the first publication of Charles Darwin's work On the Origin of Species. It is celebrated on November 24.