The main festival of the Achang.
The festival is a combination of two Achang festivals, the 窝罗节 traditionally held on the fourth day of the second lunar month 二月初四, and the 会街节 once held in late summer. http://news.yntv.cn/category/10101/2009/03/23/2009-03-23_694900_10101.shtml http://www.sohu.com/a/302361715_99960377 It looks like the main day is the second day.