I'd also like to know the answer to Mike's question. I normally wouldn't complain, but it seems a much better alternative was readily available. If all of my t-shirts were dirty and I had absolutely nothing to wear, and I wore this shirt, I'd be more inclined to tell people I found that shirt than to tell them what it's from. I wouldn't want to give anyone a bad impression of CEG.
I appreciate the effort put into organizing every aspect of Spring Zing, so I'm a little hesitant to criticize. But I think it is justified given the options that were available. If there is a good reason, great. But that's not the impression I've gotten from the people involved.