Well i think we could use a little more information. How many sororities are there? How big are they? Do you have houses? Are they on the same street (ie sorority row, hill, etc)?
I think that having like a progressive dinner could be fun. Each sorority could cooka certain part of the meal and all the sororities could visit each others houses and have fun. This is of course if theya re all in the same area and the sororities actually have houses.
