The people dressed in all white are having a good time.
The people are dressed in all black.
Either dressed in black or white.
exists e1 e2 s1 x1 x2 x3.(n_people(x1) & Theme(e2,x3) & Actor(e2,x1) & v_have(e2) & n_time(x3) & a_good(s1) & Theme(s1,x3) & all x4.(n_white(x4) -> in(e1,x4)) & Theme(e1,x2) & v_dress(e1) & (x1 = x2))
exists e1 x1.(n_people(x1) & all x2.(n_black(x2) -> in(e1,x2)) & Theme(e1,x1) & v_dress(e1))