This was from July 1969, when the opened for the Stones, and was also 4 weeks after Blind Faith (Clapton, Winwood, Baker and Gretch) made their debut on June 7th.

Rick Gretch was the bassist in Family, a local group from my hometown, and the first band I ever loaded gear into a transit van for!

Yes I was at both concert, and may have been lucid somewhere around June 20th for a few days!

It's rarely rocket science, it's usually just math: then again if you can't do the math.......