Sussex County public libraries will be closed Sept. 21 for the annual Sussex County Library Staff Development Day.

Staff from the 16 libraries throughout Sussex County will meet at Delaware Technical Community College in Georgetown for the daylong conference to study current trends and share expertise. This year’s conference includes colleagues from the Albert Wisner Public Library, the winner of Library Journal’s Best Small Library in America award in 2016.

Libraries will reopen at their regularly scheduled times on Sept. 22.