First: May 4, 2013
Last: December 19, 2013
You will be in Milwaukee around the time of Summerfest. If you like a food and music festival with all different kinds of music going on at the same time, then you might like to check it out. It is considered the "World's largest music festival."
It is held at Henry Maier festival grounds along the Lake Michigan shore line in Milwaukee. I have posted a link for you to look at in case you are interested:
There will also be a lake front fireworks display in Milwaukee on July 3, 2013 at 9 p.m. at Veterans Park. This event is free and gets very crowded. People start camping out very early in the day for this, in order to reserve seating areas. Here is a phone number for the events line: 414-257-6100.
I also noticed in your post that you will be visiting St. Josephat Basilica. If you would also like to visit a national shrine while on your trip, you will not be too far from Holy Hill, national shrine of Mary, Help of Christians, in Hubertus, WI. It is a very beautiful and peaceful place to visit.
Here is link for it:
Have a great time while you are visiting in Wisconsin!