Ellicott City B & O Railroad issued the following announcement.
This day too you may travel back to the time of the American Civil War at the B&O Railroad Museum! Join us for a special living history presentation by members of the 20th Maine Volunteer Infantry in the B&O Roundhouse. Medical displays by a Civil War surgeon and the Maine Camp & Hospital Association will be ongoing the entire weekend. Meet the soldiers and learn about camp life, the gear they carried, and troop travel by train.
Original source can be found here.
Source: Ellicott City B & O Railroad