Allie,
I hope you do get some takers. I know when I was in college the Gamma Girls would come down and go to the MSU OSU football game and vice versa. Purdue has this great lil event called the Grad Prix in the spring that was the best exchange I have ever been on. I would look into visiting them over that weekend.
It is hard to get together, but exchanges are sooooo much more fun than regionals, sorry but they are!
I found it works best to have a weekend or event you are planning around. That way you can sell it to the girls. For instance invite a chapter to come up and help with the duck race or a road trip to Windsor or some place fun but not too far.
Good Luck!