A commemoration of girl who killed herself.
Historically, both 甸南 and 羊岑 had a special festival on the first full moon of the new year, commemorating the death of a girl who killed herself because she was being bullied or abused. The stories about the girl vary a bit, but seems that this festival is not really held anymore. http://baike.baidu.com/view/351754.htm?fromId=108200