There has been additional translation performed on the Dead Sea Scrolls which has revealed a calendar of 364 with celebrations and holidays indicated. These special days were 50 days apart and celebrated different events often linked to agriculture. The scroll was deciphered by Israeli scholars at Haifa University. An article regarding this matter can be found at http://www.israelnationalnews.com/News/News.aspx/241016
If you are interested in the Dead Sea Scrolls, I would also recommend The Leon Levy Dead Sea Scrolls Digital Library at http://www.deadseascrolls.org.il/ on the internet.