An historic meeting among some of the art world’s most enigmatic young ladies will take place at the Museo Nacional del Prado in Madrid, where John Singer Sargent’s The Daughters of Edward Darley Boit (Museum of Fine Arts, Boston, 1882) and Diego Velázquez’s Las Meninas (Museo Nacional del Prado, 1656) will be shown together for the first time. On view March 16 through May 30 as part of the Prado’s series “The Invited Work,” Sargent’s painting—one of the greatest treasures at the Museum of ...