People gathered together on a city street.
A group of people are about to start a protest.
Just because people are gathered on a street doesn't mean they are about to protest.
exists e1 p1 x1 x2 x3.(on(e1,x2) & n_street(x2) & of(x2,x3) & n_city(x3) & exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_gather(e1) & n_people(x1))
exists p1 s1 x1 x2.(Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1 x3.(Theme(e1,x3) & Actor(e1,x1) & v_start(e1) & n_protest(x3)) & of(x1,x2) & n_people(x2) & n_group(x1))