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 20, 21 & 22, 2011 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 19 - May 22, 2011) 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!