Native Americans in decorative dress appear to be celebrating for a cause.
Native Americans are doing a celebratory dance as part of an exhibition.
Not all Native Americans dance for a cause at an exhibition.
exists e1 p1 s1 s2 x1 x2.(ne_nam_americans(x1) & a_native(s1) & Theme(s1,x1) & Topic(e1,p1) & Actor(e1,x1) & v_appear(e1) & exists e2 x3.(for(e2,x3) & n_cause(x3) & Actor(e2,x1) & v_celebrate(e2)) & in(x1,x2) & n_dress(x2) & a_decorative(s2) & Theme(s2,x2))
exists e1 s1 s2 x1 x2 x3 x4.(as(e1,x3) & of(x3,x4) & n_exhibition(x4) & n_part(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_dance(x2) & a_celebratory(s2) & Theme(s2,x2) & n_american(x1) & a_native(s1) & Theme(s1,x1))