尾牙，是中国东南沿海地区的民间传统节日，源于拜祭土地公的仪式。每月的初二与十六，是福建商人祭拜地主公和土地公的日子，称为“做牙”。二月初二为最初的做牙，叫做“头牙”；年尾十二月十六的做牙是最后一个做牙，所以叫“尾牙”。而拜祭后的菜肴开大餐即称为打牙祭。每到年尾，各华商会在尾牙期间宴请员工，以犒赏过去一年的辛劳。尾牙发展到今天，演变成各公司企业在当日举行聚餐晚会和员工联谊活动，称作尾牙宴，尾牙聚餐，或者企业年会。
Wei Ya is a traditional Chinese festival which originated from the ceremony to worship Tu Di Gong(the Earth God). The Hokkien Chinese worship the Earth God on every second and sixteenth day of every lunar month; this is called "Zhuo Ya"("Zhor Geh" in Hokkien). The second day of the second lunar month’s Zhuo Ya is the first of the year, thus it is called "Tou Ya"("Tao Geh" in Hokkien). The sixteenth day of the twelfth lunar month is the last Zhuo Ya of the year, thus it is called "Wei Ya"("Boey Geh" in Hokkien). After the Zhuo Ya worship, a feast called the "Da Ya Ji" which includes the dishes used for offering is organised.
Every year end, Chinese companies will show their appreciation for their employees’ hard work by having company Wei Ya dinners. Now, Wei Ya dinners have evolved into annual parties or annual dinners for the employees to both celebrate and network.
