After the Trail Loppet, you will no doubt want to try more trail runs. Here's a great resource to find them. Also you can find out more about trail runners in Minnesota.
http://www.uppermidwesttrailrunners.com/activitycalendar.html
I have run In Yan Teopa (Sep 26) five times and can't wait for this year's race. It's low-key, scenic and has a bit of everything. And you get a nice, beefy mug just for finishing.
I ran Great Pumpkin Chase (Oct 31) once and can recommend it if flatter is more to your liking than hillier.
But, it's opposite Surf the Murph at Murphy-Hanrehan (the hills may be big but at least there's a lot of them) and Nordic Commando at Battle Creek (also hilly but far shorter).
Chris