2:00pm-4:30pm. Join our Dungeon Master (DM) to learn about Dungeons and Dragons and start playing the magical mystical role playing game (RPG)! The DM will bring prepared characters so all you need to do bring is yourself! Calvert Library Prince Frederick, 850 Costley Way, 410-535-0291 or 301-855-1862. CalvertLibrary.info.