There are at least 5 artists by the name Fat:
These are photos from concerts where Fat played, so they may be of other bands that played the concert as well.
Paul Butterfield Blues Band / Fat Oct 30, 1970 Island Park, New York, United States Uploaded by Zimtrim
Frank Zappa / The Mothers Of Invention / Fat Oct 16 - 17, 1970 Port Chester, New York, United States Uploaded by Zimtrim