Walter Keenan says "The show on 6/2/85 at The Stone was cancelled so Jerry and Phil could attend Wagner's Ring. I still have the my ticket. Plus the cancellation was referenced in by Blair in the Golden Road (Summer 85)."

It was the first time the complete cycle of the Ring had been performed in many years and for those into that it was not to be missed.

http://query.nytimes.com/gst/fullpage.html?res=9F07E3DA1539F934A35755C0A963948260

http://www.nybooks.com/articles/article-preview?article_id=5383