A large crowd of people walking.
A large crowd of people walking as the go to the event
The crowd walking doesn't imply there is an event.
exists e1 s1 x1 x2 x3.(a_topic(x1) & of(x1,x2) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_people(x2) & n_crowd(x1) & a_large(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3 x4 x5.(n_event(x5) & n_go(x4) & a_topic(x1) & of(x1,x2) & to(e1,x5) & as(e1,x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_people(x2) & n_crowd(x1) & a_large(s1) & Theme(s1,x1))