All U.S. Walmart stores will provide free health screenings on Oct. 15

Each of the nation's 4,600-plus Walmart stores will provide free health check-ups and low-cost immunizations on Saturday, Oct. 15 as part of Walmart Wellness Day, believed to be the nation's largest one-day health event. Dubbed "America's Biggest Health Fair" last year, Walmart changed the name for this year's event, but the services provided will remain the same.