Four migrant workers were invited to a high profile gala in Beijing , which was once mainly reserved for distinguished intellectuals. Chinese leaders including Xi Jinping were present at the event organized by the Communist Party of China (CPC) Central Committee to mark the Lantern Festival. New guests to this year's show also include representatives from different sectors and model workers. China has 260 million migrant workers by 2012. They usually leave their hometown to seek employments in urban areas. The Lantern Festival falls on Sunday this year and traditionally marks the end of the Spring Festival season. China's central and eastern parts are expected to be blanketed by heavy fog Sunday, the Chinese Lantern Festival. The National Meteorological Center issued a yellow smog alert Sunday morning. Thick fog, lowering visibility to less than 1,000 meters, shrouded central and northern parts of Jiangsu and areas in Zhejiang early Sunday morning.