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.
Donovan / the buckinghams / Midnight Strings Quartet Sep 23, 1967 Los Angeles, California, United States Uploaded by Zimtrim
The Mamas and the Papas / The Buckinghams / Moby Grape Jun 25, 1967 Pittsburgh, Pennsylvania, United States Uploaded by Zimtrim
The Turtles / Tommy James & the Shondells / The Buckinghams / The Blues Magoos / the electric prunes / lou christie / Bryan Hyland / The Royal Guardsmen / the casinos Apr 8, 1967 Montgomery, Alabama, United States Uploaded by Zimtrim
Simon and Garfunkel / the buckinghams Mar 31 - Apr 2, 1967 West Covina, California, United States Uploaded by Sundae
The Beach Boys / Neil Ford & the Fanatics / Ca$inos / the buckinghams Mar 25, 1967 Houston, Texas, United States Uploaded by Zimtrim