Recurrence pattern: every year on November 30.

National Mate Day, observed in Argentina every November 30, celebrates the country's national drink, mate, and honors the birthday of Andrés Guazurary, the only Argentinian caudillo of fully indigenous origin. Established by the National Congress of Argentina in December 2014, the day commemorates Guazurary's efforts to restore yerba mate plantations during his governorship of Misiones Province from 1815 to 1819. Mate, a caffeine-rich herbal drink made from the leaves of the yerba mate plant, has deep cultural significance in Argentina and is traditionally consumed in social settings, often shared among friends and family from the same gourd using a metal straw called bombilla. The drink's preparation involves soaking dried yerba mate leaves in hot water, and it can be enjoyed either sweetened or unsweetened. National Mate Day has been celebrated annually since 2015, highlighting the importance of mate in Argentine culture and its historical roots.