Darwin Day is observed on February 12, 2019 and intends to commemorate the anniversary of the birth of Charles Darwin in 1809. The day is used to highlight Darwin's contribution to science and to promote science in general. Charles Robert Darwin was an English naturalist, who established that all species of life have descended over time from common ancestry, and proposed the scientific theory that this branching pattern of evolution resulted from a process that he called natural selection.
In the late 1990s, two Darwin enthusiasts, Chesworth and Stephens, co-founded an unofficial effort to promote Darwin Day. In 2001, Chesworth moved to New Mexico and incorporated the "Darwin Day Program". In 2004, the New Mexico Corporation was dissolved and all its assets assigned to the "Darwin Day Celebration", a non-profit organization incorporated in California in 2004 by Dr. Robert Stephens and others and the Mission Statement was expanded.
Some celebrants combine Darwin Day with a celebration of Abraham Lincoln, who was also born on February 12, 1809. Still others like to celebrate the many noted individuals that influenced or were influenced by Darwin's work, such as Thomas H. Huxley, Charles Lyell, Alfred Russel Wallace, Carl Sagan, and Ernst Mayr. (With material from: Wikipedia)