A band plays a concert for fans.
A marching band performs outdoors.
A band is not necessarily a marching band, and concerts do not have to be outdoors.
exists e1 x1 x2 x3.(for(e1,x3) & n_fan(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_concert(x2) & n_band(x1))
exists e2 e1 x1 x2.(Theme(e2,x2) & Actor(e2,x1) & v_perform(e2) & n_outdoors(x2) & n_band(x1) & Actor(e1,x1) & v_march(e1))