Notes
LIA to CXL: A 1974 article "explains that the GD had dropped out of a prospective 'July 4th superconcert' in Columbus, OH, with The Band and Eric Clapton.” (Branigan, Brian. 1974. A Dead 4th of July. Unknown publication, W I.) No other information known. The Dead were then scheduled for the July 4 Oshkosh show that didn't happen. The Columbus 'superconcert' is secondhand news so more confirmation is needed; but it's curious that in two separate cities that July, Eric Clapton was said to be appearing with the Dead." David Davis: David DavisSaturday, May 28, 2016 at 5:25:00 PM MDT: "Clapton & Friends were to headline with the Dead and the Band in Columbus, Ohio see attached ad. Clapton did play Columbus on that date indoors at a different venue and The Band played Wentzville, MO.
ad: Indianapolis Star, June 9, 1974, p. unk, via David Davis.