[SimonPStevens]

I worked at a comedy club during university and this is totally normal.

We would usually have a set of comedians booked for the whole weekend, and in the main their performances over the three nights would be identical. There was the very occasional one who would do some ad-lib back and forth with the crowd for a few minutes, but even those you would start to notice a pattern of repeated jokes, or types of jokes if they were booked for more than a few nights.

What was interesting was seeing the same acts return months later and find their set was still 80% the same. They evolved material slowly over time.