Mr Big (note that there is no period after "Mr") was a UK act from the 1970s. It was a stage name for vocalist Jeff Dicken. His biggest hit was "Romeo" in 1977.
These are photos from concerts where mr big played, so they may be of other bands that played the concert as well.
mr big / The Throbs / heartland May 6, 1991 Bradford, England, United Kingdom Uploaded by Craig Dalton
mr big / The Throbs / heartland Apr 29, 1991 Newcastle upon Tyne, England, United Kingdom Uploaded by Craig Dalton
1st Hemsby 70s Glam Rock weekender Apr 26 - 28, 1991 Hemsby, England, United Kingdom Uploaded by Kapt Kopter Credit: Steve Gray