Giacchino (left) with Gonzo (performed by Dave Goelz, center) and J. J. Abrams (right)

Michael Giacchino at 50: A Birthday Gala Celebration is a concert held at Royal Albert Hall in London on October 20, 2017. The concert celebrated the life and work of composer Michael Giacchino, featuring selections from the many films he's scored.

Gonzo made two appearances during the concert - one wearing one of his stunt outfits. Later, he appeared (in his purple tuxedo) to sing a duet of "I'm Going to Go Back There Someday" with Giacchino.