IDPA in Ripon, Racine, and Sturgeon Bay pretty heavily; USPSA is great in Rhinelander and way out West (I think Ripon runs it too). 3/Multigun spread all over the state. Lots of competition although I wish USPSA would feature more heavily in the Green Bay area since I hate driving.
If you shoot any of those three sports http://wisconsinshooters.com/joomla16/ is the go-to site for all your results and finding match hosts in the state (they've got steel challenge and cowboy action clubs on there too).