I am up for it, God willing and the creek don't rise! Maybe start a thread in the Lounge and I'll sticky it. Start with best month and winnow it down to 1st/last and then finally the weekend.
I still favor Wisconsin for access to the folks there, in MN, IL and IA (MI and IN folks might be afraid to transit the ILLinois archipelago)
I liked McMiller for the ability to bring a grill and prepare our own food. The picnic site we chose sucked due to the proximity to the range/noise. The one that we passed on the road into the facility is a better choice. If anyone has a private range or land that might be a good venue also.
The two day format is beneficial for people who might drive a distance to get there. Doing a one day turnaround if travelling hundreds of miles is tough. If they are quartered close it's a better deal for dinner/breakfasts etc. I am 75 minutes away so it makes it more difficult for those functions unless I get a room or camp also.
Settling on a date that affords more activities could also be a draw for people driving in from out of the area. Summerfest in Milwaukee is an excellent music venue with top acts. Bicycling/motorbiking can be done anytime with an abundance of dedicated trails and the Kettle Moraine areas for scenic splendor.