Mark Matthews of Clean Slate America talks about the expungement process. For people who have been convicted of certain crimes, expungement is a way to get their criminal record erased. Matthews will explain what expungement is and how to go about getting it done. The workshop will take place Pennsylvania Ave. branch of the Enoch Pratt Free Library on May 28 at 10:00 a.m. to 12:00 p.m. at 1531 W. North Avenue Baltimore, MD 21217.