People attend Balloon's Day Parade of 2019 Brussels Comic Strip Festival

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zhang Cheng)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zhang Cheng)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zheng Huansong)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zhang Cheng)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zhang Cheng)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zhang Cheng)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zheng Huansong)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zhang Cheng)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zheng Huansong)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zhang Cheng)

People attend the Balloon's Day Parade of the 2019 Brussels Comic Strip Festival in Brussels, Belgium, Sept. 15, 2019. The Balloon's Day Parade is a traditional show during each year's comic festival. (Xinhua/Zheng Huansong)