(AREA) -- A conservation group that works to restore the Great Lakes is looking for volunteers to help clean beaches in four states later this month. The Alliance for the Great Lakes is holding its annual Adopt-a-Beach event Saturday, September 21. The group is asking individuals, community groups and school groups to show up at Great Lakes beaches for three hours and help pick up trash. Thousands of people showed up last year and collected more than 17,000 pounds of garbage. Volunteers also performed water-quality tests to determine the lakes' health. This year's event will again be held at beaches in Illinois, Indiana, Michigan and Wisconsin. To find out where events are being held or to sign up, register online at www.greatlakesadopt.org In Huron County, cleanup is scheduled at the Sleeper State Park and the Port Crescent State Park. At Port Crescent, the cleanup will take place along the Saginaw Bay of Lake Huron. The concentration will be the campground beach to the mouth of the Pinnebog River.