It looks like they are reviving their half marathon with a new course - next weekend. Plus, they have race day registration. I'm not sure how similar this would be to the old Stillwater half or marathon, but here's the course map:
I'm still thinking about whether I could make that one work. We have a wedding that weekend so I'm not sure... Plus, I worry about potential heat. Last year it was perfect, so maybe the luck will hold? I really liked the course, and the first half was definitely the better part.