If you remember Cornerstone Magazine after which the festival was named, you might remember the Oboe Jones comic by Kevin Frank which appeared 27 times in the mag. In 2011, Kevin uploaded all the comics. You choose an edition and then click on the image, and then click the little magnifier thing to see it full size.
Now, I know Kevin doesn’t like it when bloggers embed his stuff — physically impossible with these anyway – so you’re going to have to click through for this one, but the particular link here is a great memory of the Cornerstone Festival, in this case the one from 1994. (But somewhat representative of all of them, the last one I attended being 1986.) If your internet connection can handle something 5,000 pixels wide, click through for Postcards from the Web. (The teaser sample here is just a very small part of a much larger scene.) You might even find Waldo, though I’m not sure if Waldo is there to be found.
You can also catch up with Kevin’s more recent work at KevinFrank.net