An interesting situation arises here @Stephan Hornick. The Kenzer contest was held in the 2000's. I think we should remove old news from the archives. Thoughts?
I suggest keeping them but striking them through. That way you can read them but also know they are no longer relevant (and may contain dead links, too).
I like the idea of using typography to denote expired content.
I think strikethrough would create too much friction for reading.
Maybe a grey font colour? With a starting warning standard boilerplate warning of "This is expired content. We're posting it as we think it still has some value for reference purposes." Or something like that.