Where abouts in MN are you? I'm from central WI and have been going to launches in MN for a while. The launches I attend most often are the MASA group,
http://www.mn-rocketry.net/masa/. MASA is a NAR group which caters more towards the low end, but also has some high power flights. They're located in the twin cities area. There is also a Tripoli prefecture in the twin cities area,
http://www.tripolimn.org/. There's another Tripoli prefecture a little ways south,
http://www.tsmrockets.com/. I've never been to that one myself.
Mike