National Lemonade Day is celebrated on the first Sunday of May, encouraging people to enjoy lemonade and support children running lemonade stands. Founded by Lisa and Michael Holthouse, the day promotes entrepreneurship among children, teaching them valuable lessons about responsibility, finances, and teamwork. Participants can support local children by purchasing lemonade, which helps build their confidence and understanding of business. The event is observed across various U.S. territories and Canada, where kids can register their stands online. Additionally, some restaurants participate by offering discounts or free lemonade while contributing to charitable causes. Overall, National Lemonade Day is about enjoying a refreshing drink and fostering community spirit.