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[edited by: aakk9999 at 12:23 pm (utc) on May 14, 2015]
[edit reason] Corrected a typo [/edit]
You could rewrite the page in the past tense, e.g. "Back in the day, this event was a real barn-burner. We kept this page up to show you what you missed...blah, blah" Then it still has some semblance of usefulness. It's also an effective technique for business listings where the business has gone out of business. People will still search for it.