Mariachi Day is celebrated worldwide every January 21, honoring the rich tradition of mariachi music and Mexican culture. This holiday, while unofficial, encourages enthusiasts to engage with mariachi music, which originated in western Mexico in the 18th century as son jalisciense, a folk style influenced by Spanish string instruments. By the late 19th century, Jalisco became the epicenter of mariachi music, which evolved to incorporate European influences such as waltzes and polkas. The urban form of mariachi emerged in the early 20th century when farm workers brought it to Mexico City, particularly around Plaza Garibaldi, known as the home of mariachi. Celebrations may include listening to mariachi bands, attending concerts, or watching films featuring mariachi music, such as Disney’s "Coco." Participants are encouraged to share their experiences on social media using the hashtag #MariachiDay.