He posted an open invitation on Douyin, China's short-video platform, ahead of his wedding. A young man in China who worried that his wedding would feel empty because he had few relatives to invite ended up celebrating with thousands of strangers. What began as a personal invitation posted on social media turned into a large gathering, with people travelling from different parts of the country to bring gifts, prepare food and help organise the event.As reported by Global Times, 24-year-old Xu Chenghong, from Yiliang county in Yunnan province, posted an open invitation on Douyin, China's short-video platform, ahead of his…