I just relived the anxiety.
It almost happened in the CAA conference in 2016 by not getting the games finished on time due to a rain delay. It wasn't a normal rain delay. If they didn't get the games finished, even after playing for several days, it would just go to the top seed. It could have been a huge bummer because William & Mary had come from behind in the bracket to get to the championship game, come from behind in the game to tie it in the 9th, THEN A 27 HOUR RAIN DELAY! They squeaked it in within minutes of the deadline, by W&M players helping on the field to get the field ready (they felt like UNCW was dilly-dally-ing because they wanted to default to the top seed), and W&M wound up winning it in 12 innings:
https://www.facebook.com/watch/?v=740003453437424
Moving the venue, I would venture, is a nightmare to getting many hotel room reservations for several different teams and the travel logistics on short notice (and in the CAA the top seed gets the best hotel, the bottom seed gets a flea bag motel - - really).
Smoke, will be rooting for Swarthmore!