Really, it's a chocolate or vanilla sort of thing.
The 50 plus the 24 will be more versatile than just the 35. However, the classic "holy trinity" of wedding primes is the 35, the 50, and the 85. The 24 can substitute for the 35, but 24 is getting quite wide for people shots. similarly, the 135 can substitute for the 85, but it's a bit tight and it's easier to crop the 85 than back up most of the time.
The other holy trinity of event photography is the 16-35 f/2.8, the 24-70 f/2.8, and the 70-200 f/2.8. It's not quite as fast, but it's far more versatile. (And, of course, there's a comparable f/4 holy trinity for the cheapskates or those who always shoot in bright light.)
I think your best bet would be to rent the f/2.8 trinity for your next gig. You can then simultaneously see if you prefer the zooms or if there's a particular set of focal lengths you're drawn to. for example, if you not only never reach for the 16-35 but never even rack the 24-70 all the way in, then you know that the 35 is the lens for you.