Macy’s offers customers a one-day 30 percent discount with a $5 donation to the March of Dimes® or thousands of other participating local charities MIAMI, 2015-8-25— /EPR Retail News/ — Macy’s invites customers to participate in its 10th annual national “Shop For A Cause” charity event on Saturday, Aug. 29, 2015. Macy’s “Shop For A Cause” is a…