Karl Speck sent these two dates:
“I found 2 missing shows ….. March 12, 1975 Charleston Civic Center, Charleston, West Virginia. The top billing was Humble Pie … Sunday Gazette – Mail newspaper… Charleston, West Virginia…. Sunday March 9, 1975… Page 88… Shown was a concert ad.
Also the ”Ox” band played in Atlanta Georgia on March 13, 1975 . So far the Atlanta Constitution newspaper failed to provide the name of the venue….. just the date. “