The post office, schools, local banks and government offices will be closed Monday for the Labor Day holiday.City hall, and county and federal offices also will be closed for the holiday.Lamesa school children get a three-day weekend, as they will be off Monday and return to classes on Tuesday.Students attending Dawson, Klondike, Borden County, O’Donnell, and Sands school systems also don’t have class Monday.The Lamesa Area Chamber of Commerce and the public library are closing their doors for the day Monday.Local grocery stores, however, will be open Monday.