Possibly a dinner to welcome the Dixie Mission, American Observation Group. Mao Zedong sits at the far side of table wearing a dark shirt and holding a cigarette in his hand.
Source of Descriptive Information
Alexander, B. (1992). The triumph of China: the middle kingdom's long march from degradation to world power in the twentieth century. Farrar, Straus & Giroux. Available at http://bevinalexander.com/china/27-dixie-mission.htm