A person sitting on chair in front of a crowd.
A person awaits the concert.
Just because a person is sitting in front of a crowd does not mean they are waiting for a concert.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x4) & of(x4,x5) & n_crowd(x5) & n_front(x4) & on(e1,x3) & n_chair(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_person(x1))
exists e1 x1 x2.(n_concert(x2) & Theme(e1,x2) & Actor(e1,x1) & v_await(e1) & n_person(x1))