The Celebrity Mercury will return to the Port of Charleston today (Thursday, March 18) to disembark guests.  There are no road closures planned in association with the disembarkation process on Thursday. The Mercury is scheduled to board passengers on Sunday, March 21.  Starting at approximately 11 a.m. on Sunday, a small portion of Concord Street will be closed from just north of North Market Street, north to the intersection just south of Hasell Street on Washington Street.  For access to and from areas north of Union Pier Terminal, such as the South Carolina Aquarium, Fountainwalk and Gadsden Wharf residential units, drivers may use Laurens, Calhoun and Charlotte streets.