Mario Day (also written as Mar10 Day) is an annual celebration of the entire Mario franchise. It takes place on March 10th each year, the reason being that this date, written as "Mar10", looks much like Mario's name. The holiday could be celebrated by dressing up as Mario, having a Mario-themed party, or simply playing Mario games, among others. Although the holiday was not created nor declared by Nintendo, the day was unofficially celebrated by most Mario fans. Since 2016, Nintendo has officially embraced the holiday and started celebrating annually by promoting Mario games and holding Mario-themed events.