Depending on when you're in there's a lot of suburban folk societies that run weekend shows. Many of them are easily accessible by train. In Chicago itself, check out the Old Town School of Folk Music. If you're still there on Sunday night there's an on-going folk night from 7-9;30 at Bill's Blues in Evanston then. If you happen to be in the area on Oct. 9, the band playing there will be mine.