Congress is a huge deal, because of it’s sheer size, no qualifying, major horse sales (private and official auction sale), and major, major shopping show (think two supermarket sized buildings full of booths + trailers outdoors), The jumpers that were braided could easily have also been entered in the eq over fences or hunters, but probably the eq. Hunters are very competitive there. Braiders are very busy, so you would leave them braided, not take braids out just for jumpers.
It is actually more like 3 weeks of WEF than indoors. Indoors is orderly, Congress is a Zoo, in a good way.
Congress is a bucket list item of things to do before you die, even for non-QH people.