What does the lightbox advertisement in "Along the River During the Qingming Festival" illustrate?

The time limit for urban trade has been broken. In "Along the River During the Qingming Festival", red gardenia lamps are usually hung at the entrances of hotels. The appearance of light box advertisements reflects that the time constraints of urban trade have been broken. Along the River During the Qingming Festival, one of China's top ten famous paintings handed down from generation to generation. It is a genre painting of the Northern Song Dynasty. It is the only surviving masterpiece of the Northern Song Dynasty painter Zhang Zeduan. It is a national treasure and is now stored in the Palace Museum in Beijing.