Rush dates are somewhere in the last part of Sept. My guess would be the 25-30.
We did a few things with CMU fraternities when I was first in KD... but when all the alcohol policies got changed and made more strict, we really didn't do much because it was so risky. They didn't really follow ANY rules up there, at least when it came to alcohol.
Although the ones that we did go to were fun. One house spent $800 on alcohol for us. At the time we probably had about 45 sisters
And we definately found them to be, in general, much nicer, and more respectful than what we were used to.