International Picnic Day is a made-up holiday that is celebrated annually on June 18. Picnics date back to Medieval times, when outdoors feasts were held to celebrate a successful hunt. Picnics really grew in popularity during the Victorian Era in England. The word “picnic” comes from the French language, and it’s believed this type of informal outdoor meal became a popular pastime in France after the Revolution. As fans of Jane Austen’s novels will know, 19th-century picnics were elaborate social occasions, with menus featuring a wide range of cold meats and pies that took days to prepare.