Same boat here. I'm not doing Goofy, but definitely don't want to risk injury before MW. I'm also going for a big PR in Chicago and have no idea what recovery will look like.
I'm coming for the W&D 5K for sure, so the thought of "I may as well stay through the weekend, right?" keeps running through my brain and tempting me to the challenge as well. IF it happens, I'll most definitely be taking it super easy. Even at a fairly easy pace, with my corral placement and pace I'm not really at risk of being swept. The timing post-Chicago actually aligns with traditional advice on when your first run should be post-marathon, so if I treat it like that, I think it should be okay.