THE WORD "PICNIC" evolved from the French expression pique-nique, which described a group of people who met for dinner at a restaurant and brought their own wine. After the French opened the country's royal gardens and parks to the public following the revolution of 1789, the term came to refer to groups who shared meals outdoors. If you're planning to celebrate the day with family and friends, Costco warehouses and Costco.com stock all kinds of quality picnic-friendly food, drinks and supplies.