Here are some useful links for Squash Players
The closet organized squash group to the Fox Cities is in Madison. On their web page they provide information on using the courts at the University of Wisconsin.
http://www.madisonsquash.org/
Another place in Madison to keep and eye on;
http://www.madisonsquashworks.com
The World squash organization is;
http://www.squash.org/
The national squash organization;
http://www.us-squash.org
their squash court finder is useful, but is not very up to date;
http://www.us-squash.org/tools/club-listing.php
A very interesting squash organization in Chicago is;
http://www.metrosquash.org/
Websites to find people for matches are;
http://wisconsin.sportsvite.com/
http://squash.meetup.com/
Now you just have to find a court.