Check it out below: Dolenz, Jones, Boyce and Hart on Don Kirshner's Rock Concert in 1976. I'm pretty sure DJBH also performed new material during that appearance but it's not up with these other clips (yet).
I posted a new photo in the 1996 North American Tour section (directly underneath the tour summary).
Head airs on Antenna TV today and at other times this week. Check your listings.