check out the regional forum for more stuff about wisconsin if you're interested. I live in Germantown but ride in Milwaukee all the time. I think there was talk about a bike night at the new Sonic some time soon but I haven't heard any more about it. Also,
all-out-motorsports.com is a forum that has a lot of milwaukee area riders although it's mostly a bunch of stunters and squids so I don't participate in their discussions. They do have a list of bike nights on that forum though.