You discover all the areas where it doesn't sit flat. But it is too late to fix it.
But I am too cheap and too wrapped up in doing it myself to hire it done.
So I am quilting. I am just following the rings for the most part. Then I am repeating the ring pattern inside the circles.
I will do stitch in the ditch where possible. This involves holding the fabric open at the seams with the flat of my hands and stitching in the seams to hide the stitches as much as possible.
I am going to try to do some free motion quilting on the edges of the quilt where there is a bunch of background and not a lot of ring. I took a class, one, so this should be interesting. Not good, but interesting.