The Hopkinton Trails Committee and the Hopkinton Trails Club have created a monthly trail volunteer day on the first Saturday of each month from 9 a.m.-noon. The next workday is June 1, coinciding with National Trails Day. Volunteers will work to clear invasive garlic mustard from the Center Trail. Parking is available on Claflin Place, across Main Street from Hopkinton Lumber. For more information, visit hopkintontrailsclub.com.