Crowds walk along the street.
People are walking to an event
People walking along the street are not necessarily walking to an event.
exists e1 x1 x2.(n_street(x2) & along(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_crowd(x1))
exists e1 x1 x2.(to(e1,x2) & n_event(x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))