Entire Site went BOOM after update (too many errors to list)

Once again, it was time to update (this time from 5.x to 6.x). I have my Fantastico auto-install my updates, so despite having changed the layout and files a small bit, I had always just clicked the update button and installed a new layout.

This time, that didn't happen.

The site http://www.artistsforumworkshop.org/_____/ has exploded, and I was hoping anyone had a suggestion? A few of the error messages (which make up the whole of the page) I shall give to you here, but do look at the actual page:

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(it goes on for, basically, ever.)

Obviously, I ignorantly just installed the update without much thought, but this has worked for me before. Was it a module, or the theme? I can't even find the theme now. It was the one with the hummingbird and when you rolled your mouse over the hummingbird its position would elevate slightly.