I know why...!! Isn't the Internet a wonderful tool? (except for Wikipedia
...)
Bruce didn't play Live Aid because he JUST Played London...The Born In The USA Tour played July 3,4 & 6th at Wembley Arena...maybe he thought it was redundant? He was off from the 8th to the 30th of July...and he started work on the SUN CITY Compilation.
That tour was in place a long time before this show, and probably so was the break. I saw that tour...I'M GLAD HE WAS RESTED!!