Mardi Gras is a big party that happens in some parts of the world, like New Orleans, Louisiana, and some other cities. People like to wear colorful costumes and masks and have lots of fun. It happens on the day before a religious holiday called Ash Wednesday, which is part of a season called Lent. Lent is a time when some people practice fasting and other religious activities. Mardi Gras is a big celebration that comes before this serious time, and it's kind of like a last chance to have a big party! People throw big parades with lots of music, dancing, and decorations. They also like to eat lots of traditional foods like king cake and gumbo. But it's not just about eating and drinking--it's also about community and having a good time with friends and loved ones. So, it's like a really big, fun party that comes before a serious time of year.