People are holding signs and marching.
The people are protesting.
Just because a group of people are holding signs and marching does not mean they are protesting.
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 x1.(n_people(x1) & Actor(e1,x1) & v_protest(e1))