Pancake Day, also known as Mardi Gras or Shrove Tuesday, is celebrated by making and eating pancakes. The document provides a recipe for making pancakes that includes ingredients like flour, eggs, milk, and butter. The instructions describe sieving the dry ingredients, mixing in the wet ingredients, letting the batter rest, heating a pan, cooking the pancakes until golden brown on both sides, and serving with toppings like chocolate, strawberries, or lemon and sugar. The document concludes by asking the reader to write a recipe for a traditional Spanish dish using clear imperative instructions.