IT WAS A GREAT DAY IN HARLEM, a celebration of two important women in art—Alma Thomas (1891-1978) and Thelma Golden. The artist and the director of the Studio Museum in Harlem were both born Sept. 22. Thomas would have been 125. To mark the milestone, the Studio Museum, which is currently presenting an exhibition of Thomas’s paintings and drawings, had a birthday party. The special breakfast and exhibition viewing was hosted by Golden.