http://pittsburghlive.com/x/tribune-.../s_400732.html
I believe this was a greek week event (Pitt's greek week events are spread throughout the year) because they quote the greek week chair. But there's not a very clear mention that this was a greek event.
There were 40 students dancing and over 1,500 people watching, which is a huge event for Pitt. They raise $36,713.09, which was the most successful fundraiser in the history of Pitt's student organizations. The money was going to UPMC (University of Pittsburgh Medical Center) for cancer research.
ETA: Found another article
http://www.pittnews.com/vnews/displa.../4393e9b2a3497
Seems it wasn't necessarily solely a greek event. There are quotes from a KKG, KD, XO, AEPi and LXA and the greek week chairs, but there were also some dancers sponsered by other student organizations.