You just described the farm where I live and work. And yes, things can go wrong even when you are very experienced and have taken every precaution. Exhausting does not begin to describe foaling season.
We have never had 15 foals in one season here. The max was 7 - and that was a very long process… after which the BO agreed it would never happen again.
Foaling is the best of times… and the worst of times. All at once.