The concept comes from the scenario of families and friends sitting on the lawn and picking the wild fruits, enjoying a delicious picnic and gorgeous sunshine. However, what if this food event occurred in the museum or gallery during the opening reception? This event design piece attempts to challenge social behavior in the public environment. Picnic Indoor questions whether the visitors in suit and tie or dress would behave ackwardly or unformally like squading down or sitting on the floor in the museum due to food. The audience probably will discover new perspectives to appreciate the other art pieces in the museum after interacting with this piece.