Macomb County is seeking hosts and sponsors to participate in the annual national Manufacturing Day set for Oct. 5.The event provides an opportunity for high school students to visit area advanced manufacturing facilities, see the industry in action and meet people who make things."Manufacturing is again on the rise in southeast Michigan, so it is a great time for young people to begin thinking about entering the field," said John Paul Rea, director of the Macomb County Department of Planning and Economic Development.