Not a local but I have a guy up there checking on the conditions as I am headed up for the derby also. There's a few previous posts here relating to conditions and I think the derby posted a bit about parking areas that will be plowed out on their Facebook page.
As far as ice safety, obviously it's not a normal year. Some areas froze pretty decent before they got pounded with 18 inches of snow, others only had 5 inches or so. Forecast another 12+ inches there for Thursday. I switched plans from side by side to my snowmobile for that reason.
Good luck and stay safe. Hope you and your boy get a winner!