Some random dates I found while putting together the DG results list:
Florida State
August 17 - 23 http://greeklife.fsu.edu/
Lafayette College
September 2-6 http://ww2.lafayette.edu/~reslife/fraternities_sororities/
University of Arizona
August 18 - 23 (bid day doesn't have a date, but pref is the 22nd so I'm guessing the 23rd is bid day)
https://orgsync.com/
an/set1
University of Nevada, Reno
September 1 - 7 http://www.unr.edu/greeklife/PCRec.htm
University of Tampa
September 3 - 6 http://www.ut.edu/detail.aspx?id=2714