The Contemporary Art Museum St. Louis(3750 Washington Boulevard, 314-535-4660) today announced the rest of its 2018 schedule. Of note for fans of street art, black artists and transformative American artists is the September exhibition —Basquiat Before Basquiat: East 12th Street, 1979-1980.Jean-Michel Basquiat emerged from the New York City hip-hop/punk/graffiti scenes in the 1970s as one-half of the graffiti duo SAMO, along with Al Diaz.…