I live in Cottage Grove and it takes me between hour and 30 minutes to an hour and 40 minutes to get to Siren going 80 on the freeway. Unfortunately, the tourney the old Harris team and the Warriors used to play in I've had to cancel. It was always first weekend in Aug., and class C, D, E, but MN state likes that weekend and several other WI tourneys have also sprung up that weekend so teams stay closer to home to play and don't come to Siren. Our first tourney is the weekend before Corky's, but it's also class D and lower, so your team couldn't play in it anymore. Our Best of the NW will take place July 21-22, and that will probably be an open or upper/lower, but for that you'd be required to play and finish high in a different NW WI tourney. Send me a pm of your email and I'll send you a list of possible WI tourneys. They'd all be even closer for you to travel to than Siren.
I'm going to try to figure out another weekend, possibly a Saturday only tourney at sometime during the summer that will be for C level teams, too. Naturally, there aren't a lot around the small town area, but if I could do a 1-day that could maybe interest enough teams.