yeah, I was going to suggest getting the ballpark and "crashing" some tailgate parties. When I say "crash" them, I mean walk through the parking lot, be sociable (but not an annoying know-it-all road fan) and kind, and introduce yourself as an out-of-towner to groups that look like they have similar interests (i.e. music, games, etc.) as you. Most groups will let you join them and offer you a beer/brat/burger/whatever. Plus, you can get some good conversation going, play some bean bag toss, and get many more post-game/Milwaukee area ideas of things to do. The other posts are all good ideas, too.