This mostly happens to me when it is very clear that the session is going to be about resolving something about player X’s backstory, and their work schedule changes.

The easiest way, is to use a generator, like https://donjon.bin.sh/scifi/random/.

I might not fully use the suggestion of “A minor executive named Jasper Catlow needs a crew to frame a rival named Porter Gammon for corporate espionage. However, the client hires a team of assassins to eliminate them after the job.”, but it’s easy enough to change some nouns to make an interesting one-shot.