A crowd of suburban youth wait for a performance to begin.
Crowd of youth rioting in the streets.
You wouldn't wait for a performance and be rioting at the same time.
exists p1 s1 x1 x2 x3 x4.(a_topic(x1) & Topic(x1,p1) & exists e1 x5.(Theme(e1,x5) & Actor(e1,x1) & v_begin(e1) & n_thing(x5)) & for(x1,x4) & n_performance(x4) & of(x1,x2) & n_wait(x2) & of(x2,x3) & n_youth(x3) & a_suburban(s1) & Theme(s1,x2) & n_crowd(x1))
exists x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & of(x1,x2) & in(x2,x4) & n_rioting(x2) & of(x2,x3) & n_youth(x3) & n_crowd(x1))