This sounds like it would have been a great concert --- just listen to all the acts represented in the audio clip! Donated once again by Barry Mac; he mentioned that it was odd that Black Oak Arkansas was included in the line-up, but if you notice, they were the "special guest star."
It all took place on Sunday, May 28, noon until 10 PM. What year is unknown. Ticket prices were $7! Man, I remember those prices....
Once again, KAAY lent its tremendous signal to air this advertisement.
Peoria Folk Festival ad: stream | download