i too have this date as an obsession. i was only 12, but i remember that TIME pretty well. growing up in vegas has its advantages! the I hotel had just opened and my father was working there, having been transferred from the flamingo, like so many international employees.
anyhow, i have been saving all kinds of pictures from july and aug 69. after looking thru them all, i do believe i have july 31. i have dates on my pictures only because that's how they were named when i found them on the internet. it seems elvis wore a black gi, red and blue scarf, red and black belt. the black pants had red inserts in the bellbottoms.
if someone thinks i'm wrong or right, let me know.
would you like me to go ahead and upload these to photobucket to share?
btw, i once , in 1975, made the acquaintance of fan and photographer howard wallen (i wonder where he is now?) and he gave me (a now known) photograph of elvis sitting on a stool playing guitar taken that night, he said. howard was working for a newspaper at the time and was lucky to be able to jump at the chance to be at elvis' opening night. howard seems to have sat stage edge.