Sacagawea Day is observed worldwide every December 20 to commemorate the death anniversary of Sacagawea, a Native American woman from the Lemhi Shoshone tribe, who is best known for her role as a guide with the Lewis and Clark Expedition. Born in May 1788, she was captured by the Hidatsa tribe and later married Quebecois trapper Toussaint Charbonneau. Sacagawea significantly contributed to the expedition by rescuing important records, acting as an interpreter, and demonstrating peaceful intentions by traveling with her infant son. Although accounts of her death vary, many historical documents suggest she died on December 20, 1812. While Sacagawea Day is not officially celebrated, various history museums and educational centers hold events to honor her contributions. People may observe the day by visiting sites such as the Sacajawea Interpretive, Cultural & Educational Center or the Lewis and Clark National Historic Trail, as well as reading about her life or sharing information on social media using hashtags related to the day.