Currently it's schedule for what appears to be a 2 week taper?
Hmm... I'm reading that your longest long run is on Aug. 2 at 20 miles, yes? And the race is the weekend of Aug. 23/24? That looks like a 3-week taper. that seems good. Depending on how much rest you get, you might go shorter on that last 10-mi long run and leading right up to the race.
There's a lot of talk about keeping your legs "fresh" by running soon before the race, but I feel like that applies more to faster paces than you're going to get in your 50k. Any free time you have in the week leading up to the race, get off your feet, and if possible, sleep.
As a side note, I'm very unlikely to do the full 20mi on the 2nd. That's just a really, really, really long run for me. Like 5+ hours in the hottest part of our summer.
Well, this is why I'm a proponent for running for time, not distance. Then you could call this longest long run "5 hours" (or whatever was appropriate leading up to this long run) and at least you'd know how much time you'd be spending.
I do understand this is a lot of time to spend on a run, especially in peak T+D time, but try to get out there for as long as you can (not exceeding this distance, of course). Your actual race will be 50% longer than this. Even expecting to be walking toward the end of the race, you need to build up the time on your feet.
Most ultra-running guidelines I see are to build up to a long run that is about 75% as long in time as you expect your race to be. The time limit for the 50k is 14 hours. Do you have a time goal? If you're estimating even something like 10 hours, then you're looking at a longest long run time of 7.5 hours by that guideline. Of course, planning from the beginning to have a lot of walking time would probably mitigate this to some extent, but not completely, because 30 miles on your feet at once is still 30 miles on your feet at once.
You have to do what you have to do, but the shortness of this longest long run does worry me a bit. You'll need to be really conservative on race day to not burn yourself out early.
near the race trail so I can get out on it for a few sections that weekend in July
Fantastic idea! Having a feel for even part of the trail you'll be racing will give you some confidence. It will make things feel a bit more familiar.