I used to live in Lafayette. Not a whole lot going on there musically, but you might try Java Roaster or Knickerbockers Saloon downtown.

I guess you'll miss the Indiana Fiddler's Gathering, but I'll give the link in case anyone else is interested. I might drive down there for it myself.link.

If all else fails, you can go to West Lafayette and party with the college kids, or go to the Neon Cactus and learn how to line dance.