What version Publisher?
In Publisher 2003, Insert Design Gallery Object, select Calendar. Resize the
calendar for the space, click the wand, click change date range, copy, paste,
click the wand, change date range again.
In Publisher 2007 the wizard doesn't work. You will have to insert from the
Design Gallery, copy/paste will work, but you can't change the date range.
You could open a calendar template, scroll down to wallet size and resize to fit
the space. Or select one the calendars and resize, copy/paste to a new
publication.