There are two different groups called The Buckinghams, the by far most successful being the group listed as #1, from Chicago, IL, United States.
These are photos from concerts where the buckinghams played, so they may be of other bands that played the concert as well.
Cowsills-Buckinghams-Grass Roots finale
Grass Roots / The Buckinghams / The Cowsills May 23 - 26, 2019 Jeffersonville, IN Uploaded by Jmdiff
The Buckinghams
The Cowsills