I practiced for two hours very quietly after I got home, because it was already 10pm and now it's midnight. I worked on the 3rd movement with lots of repeated practice on any spots that have been giving me trouble (which hopefully will ferment in my brain tonight) and then went back to the 1st movement, which had already magically improved from when I last practiced it.
There are so many tricky parts that I had focused on all these months while pretty much sight reading the easier parts, which meant that they always got sloppy the minute I hit record. Today I practiced every single note with intent.
I think it's going to be acceptable by the time I go but none of the movements are feeling great. The Dvorak quintet was in excellent shape last year both technically and musically; the 4th movement was weaker but still ready and I could be proud of how I played the rest. The Brahms doesn't feel remotely close to that. Well, this quartet is famously difficult and it was a bucket list piece! All I can do is see how much better I can get it in the next week. Maybe all this late night desperation will pay off