In Wisconsin anyone may vote early in person at their local election office using an "absentee" ballot.

You may do this starting when absentee ballots are available about 3 weeks before Election Day and continuing up until 5 pm the day before Election Day.

In Wisconsin, if you apply for an absentee ballot in your local election office, you must vote immediately, seal your ballot in the proper envelope, and return it to a member of the clerk's staff.  No ballots may be taken from the clerk's office

For more information, please contact your local election office - link on right sidebar.