A band performs on stage.
People are listening to a rock concert.
The band performs onstage but there isn't necessarily people listening to them. There are other genres of music the band could be playing besides rock and they aren't necessarily playing a concert.
exists e1 x1 x2.(on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_perform(e1) & n_band(x1))
exists e1 x1 x2 x3.(to(e1,x2) & n_concert(x2) & of(x2,x3) & n_rock(x3) & Actor(e1,x1) & v_listen(e1) & n_people(x1))