My family is from the clans Robertson, Sinclair, Lamont, and Shaw.
...and, BTW, Chicago has a few Highland festivals each year. While not quite the on par with the Stone Mountain, Georgia, crowd, it's fun for us to get together.
The 2004 Illinois Saint Andrew Society Highland Games - June 2004. This one is the most fun. Rugby, Haggis, and Scotch! Little Blackfive got a Scotland Football Kit last year.
7th Annual Celtic Festival in Chicago - September 2004. This is a smaller version of the above and, while it includes all Celts, it has about equal amounts of Scottish and Irish music, food, and games.
Just remember to call it a KILT, not a skirt!...or you're liable to get hurt.