UWBadgers.com has a few items of interest:
First is a very nice collection of links relating to the Frozen Four and our semi-final matchup with RIT.
Second is an article going over some of the fan events set for this weekend. Evidently, Cheli's Chili Bar (owned by Chris Chelios) has been given the official blessing by UW Athletic Dept. and the Wisconsin Alumni Association as the certified "Badger Bar" for the weekend. Any of you who find yourselves in Detroit this weekend will be sure to find friendly faces and plenty of red there. Evidently, more events (including UW Marching Band appearances) will be announced soon, via the website, facebook and/or twitter.
As for "official" hangouts in Wisconsin? I don't know of any. Certainly, Madison will have plenty of great places to hang out and watch the game(s). Echo Tap is a place that has traditionally had a good hockey crowd (despite having the worst wings I've ever eaten). If State Street Brats or Buffalo Wild Wings don't have the game on their mega-huge screens, their managers should be fired out of a cannon.
I haven't heard anything about any get-togethers around Milwaukee/Waukesha County. If you, oh faithful readers, have heard of anything, feel free to share it in the comments section.