OK... To all AGD's ~ AGD was not represented on my campus, so I had no idea when AGD's Founders' Day was. I took a guess based on the date AGDLynn suggested.
Anyway ~ Oct. 11 (which is a Thursday) is 1 month after the tragedy; and I feel this would be a highly appropriate day for an all-Greek "let's all wear our badges with red/white/blue ribbons and show our solidarity" event. I am sure (sad as I am to say it) that members of almost every GLO were lost in the terrorist attack.