A group of men in traditional costumes perform a ritual.
a group of men are in costume.
Both sentences state that the men are in costumes.
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_perform(e1) & n_ritual(x4) & of(x1,x2) & in(x2,x3) & n_costume(x3) & a_traditional(s1) & Theme(s1,x3) & n_man(x2) & n_group(x1))
exists p1 x1 x2.(exists x3.(in(x1,x3) & n_costume(x3)) & of(x1,x2) & n_man(x2) & n_group(x1))