I don't think that many shows (that have regular laughing) are filmed before audiences anymore (late night is the exception). Sit-coms use canned laughter. I suspect that if tape delayed before an audience (live is rare as hell), laughter (or lack of it) is supplemented with canned laughter.
I was never
in the audience, but I was
on a local dance show in Windsor Ontario (Ch 9 CKLW) in Jr Hi (I seen to recall Robin Seymour was the host). In the beginning, there were only two of us guys who would dance with the girls at sock hops, and we became pretty popular (for dancing only). Both of us got asked several times by different girls, and their mothers picked us up from home (no one had a driver's license yet) an took us round trip.
There was not any laughter, but we were required to wear coats and ties, and there was a shitload of sweating.......those TV lights were murder. Especially while doing strenuous dancing.
I'm not in this one, but I was there a few times.
https://www.youtube.com/watch?v=xH3G7Y25qm4 Saw a young Bob Seger there, and at several other school sock hops of the era.
https://www.youtube.com/watch?v=LMUrxXwL-NM