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The National Gallery of Art has finally figured out that it’s got some atoning to do. Last year I remarked on “Glory of Venice” curator Andrew Robison’s blithe embrace, in his opening-day lecture, of Giovanni Battista Tiepolo’s magnificent but virulently racist The Finding of Moses. Of course, if you’ve got your rococo goggles on, morality is job six. If, however, you’re inclined to look critically on great painters’ conceptions of blacks as both demons and exotics, join NGA intern David Hart for a discussion of “The Representation of Blacks in Old Master Paintings.” At 2 p.m. at the National Gallery of Art’s West Building Rotunda, 6th & Constitution Ave. NW. FREE. (202) 737-4215. (GD)