 By 1947, the regular schedule of two summer exhibitions had been reestablished.The rise of Abstract Expressionism—intensified by the location of Hans Hofmann's summer school here—again riffled the deep divisions within the arts community during the '50s.When PAAM celebrated its 50th anniversary in 1964 with a retrospective show of its major artists, the organization focused on gaining national attention for Provincetown's considerable contribution to American art.