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Since nobody answered I found something myself. Ali vs. Jody Ballard and Michael Dokes, April 16 1977. It could be that Ali had two exhibition matches in one day another time too. https://www.youtube.com/watch?v=AnV9pef8X_I
There was a time in 1975 where George Foreman fought 5 amateur boxers in a row and Ali was there providing color commentary (mostly using it as an opportunity to verbally abuse Foreman). It was broadcast on Wide World of Sports: https://www.youtube.com/watch?v=Oi-P7I6pZvQ
I am probably misremembering this, but what I remember is seeing Muhammad Ali on TV boxing two exhibition fights in one day, possibly one right after the other. On Wide World of Sports or some other Saturday sports show from the early to mid 1970s. I further recall that one of his opponents (probably the second) was sitting in the audience, wearing his gear, and Ali was mock-upset over this. ISTR the second opponent was someone I'd heard of. I didn't "follow" boxing so I only recognized the names of a few people: Ali, Frazier, Norton, Foreman, maybe a few others. I'm reasonably sure it wasn't his boxer-vs-wrestler fight vs Antonio Inoki, they were both boxing matches.