ah. The Warehouse. Saw many concerts there. I am not sure I saw the concert you mentioned but I saw Ten Years After, Pink Floyd, ELP and others at that venue.
In those early years you could get quite close to the stage. In 1970 I saw Pink Floyd when there were probably less than a hundred people there. I was able to lean on the stage just a few feet from the band.
“In those early years you could get quite close to the stage.”
I know what you mean. My ears still ring!