On July 13, 2013, Dutchie Caray threw out the first pitch at a Cubs game against the St. Louis Cardinals. This isn't the first time she has thrown out the first pitch but it is the first and only one I've been able to find a picture of to use for the custom. The Cubs would go on to win this one 6-4.
Also of note that day, and probably the reason she was invited, was that the Cubs were giving away a Harry Caray replica statue to the first 10,000 fans. I "borrowed" the photo below from an ebay auction. They are going for a pretty penny right now so I'll have to wait until the bidding frenzy dies down a bit or live without.