Can’t say I’ve heard of that. The one I’m thinking of might have been an award show of some kind. The cantina guys were a backdrop for people presenting something or other during the whole thing. I thought it might be that Science Fiction Film awards show where Shatner infamously sang Rocket Man, but that was 1978, so too early for Giger’s Big Chap to be in attendance.

JEDIT:Okay, I have seen Starstruck on youtube, but I doubt I actually saw it back in the day. In any case it’s not the tv show we’re looking for.
And it isn’t the sci-fi comedy series Quark, either. 😃