At Fillmore East June 27, the Fillmore East closed, and the band were invited to play a final, invitation-only concert, along with Edgar Winter, the Beach Boys and Country Joe McDonald. The Beach Boys initially refused to perform unless they headlined the event, but Graham refused, telling them that the Allman Brothers would be closing the show, and they were free to leave if they disagreed. The Allman Brothers' performance was used for additional tracks when an expanded version of "At Fillmore East", "The Fillmore Concerts", was reissued on CD. "At Fillmore East" showcases the band's eclectic mixture of blues, rock, country, and
Hampton Grease Band cult following, and was re-released on CD in 1996 with several minutes of additional material that had been edited off the vinyl release. The band was the lead-off band for Frank Zappa/Mothers last appearance at the Fillmore East on June 6, 1971. It was at this concert that Zappa and the Mothers recorded part of the "Live at the Fillmore East" album. Later that evening they were joined by John Lennon and Yoko Ono, also available in recorded versions. Lead guitarist Harold Kelling died in May, 2005. The Hampton Grease Band held their first reunion concert on June 2, 2006,