I am planning on making a roasted beet salad and wonder if it will keep for several days before serving . https://www.justapinch.com/recipes/salad/ot

I would not assemble it ahead of time. I often roast beets and keep them in the fridge until I'm ready to use them. When you roast them, add a splash of red wine vinegar before you wrap up the foil. It will prevent them from bleeding.

Here's another tip: as soon as you peel the beets, while they're still warm, toss them quickly with a few tablespoons of whatever acid (vinegar, lemon juice) is in the dressing. They'll absorb it and it will help cut the sweetness of the beets (which, when roasted, always seem just a bit too sweet to me). The beets will definitely keep for several days. ;o)

If you're short of time on the day of or just before, roast the beets, hold in the fridge and then dress shortly before you want to serve...a few hours or overnight.
I find roasted beets (and other veg) hold nicely a few days in the fridge, but salads lose something in taste and texture.
I eat them if I have leftovers, but I wouldn't plan a 3-4 day old dressed salad for guests.

bailboy, that link didn't work. I'm happy to advise on this once you post a working link. Thanks! ;o)