People are holding signs and marching.
People are having a peaceful riot.
Many peaceful riots contain signs and marches.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_march(x4) & n_sign(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_people(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_riot(x2) & a_peaceful(s1) & Theme(s1,x2) & n_people(x1))