Qingyuan Cave is at the eastern side of the Fengyu basin, the event is said to attract several thousand people.
http://qcyn.sina.com.cn/dali/fqdl/2012/0904/12021594038.html
http://dllkhdwz.blog.sohu.com/82205163.html
Festival held according to lunar calendar on 农历6月13.
