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Oh, look at that, a similar event with bigger bands and less national fanfare...

“His moniker was given to him by B.B. King at the Texas International Pop Festival in 1969.”

BB King was there all 3 days and enjoyed the people. Full audio (and such comments) can be found on youtube.

https://en.wikipedia.org/wiki/Texas_International_Pop_Festival
The Texas International Pop Festival was a music festival held at Lewisville, Texas, on Labor Day weekend, August 30 to September 1, 1969. It occurred two weeks after Woodstock.

Saturday, August 30
Canned Heat
Chicago Transit Authority
James Cotton Blues Band
Janis Joplin
B.B. King
Herbie Mann
Rotary Connection
Sam & Dave
Sunday, August 31
Chicago Transit Authority
James Cotton Blues Band
Delaney & Bonnie & Friends
The Incredible String Band
B.B. King
Led Zeppelin (announced as “The Led Zeppelin”)[10]
Herbie Mann
Sam & Dave
Santana
Monday, September 1
Johnny Winter
Delaney & Bonnie & Friends
B.B. King
Nazz
Sly and the Family Stone
Spirit
Sweetwater
Ten Years After
Tony Joe White