The generous contributions of these community-minded, local businesses help to make the Mount Prospect Garage Sale Weekend possible.   Sponsorship info The Mount Prospect Garage Sale Weekend May 16, 17 & 18, 2008 Picking up your FREE Mount Prospect Garage Sale Map You will be able to pick up a FREE map of the participating homes Thursday through Sunday (May 15 - May 18, 2008) at the locations listed below. If you have visited this page before, please click on View/Reload, View/Refresh, or press the F5 key to reload the page for the most current information!