Imagine a really big carnival where everyone comes from all over the world to buy and sell things. This carnival takes place in a city called Lille, which is in France. This carnival is called Braderie de Lille. It happens every year on the first weekend of September.
Now, let's imagine that you are at this carnival. You are walking around, and there is so much to see! There are lots and lots of tents and tables set up all over the streets. These tents and tables are like mini shops, just like you see in a mall.
But, instead of a mall, everything is being set up outside, on the streets! Lots of people come here to buy things, and lots of people come here to sell things. It's like a big garage sale, except it's not just one family selling their old things - it's lots of people selling all sorts of things, like clothes, shoes, toys, books, antiques, and even food!
As you walk around, you see that many people are dressed up in special costumes. They are wearing funny hats, glasses, and big boots. These costumes are called "chef hats." People wear them because they want to have fun and enjoy the carnival.
One of the most popular things to buy at the carnival is a special food called "moules-frites." This is a French name for a meal of mussels and fries. Lots of people eat this meal while they are walking around the carnival.
One more thing to know about the Braderie de Lille carnival is that it is very, very big. It stretches over 100 kilometers, which is a really long distance! It's so big that it takes over the whole city of Lille, and even spills over into other towns nearby.
So, in summary, the Braderie de Lille carnival is a big carnival that happens every year in the city of Lille, France. Lots of people come here to buy and sell things, wear fun costumes, eat special food, and have a good time.