Audience at an event with the stage lights as the backdrop.
A group of fans at a consert
The presence of a stage and an audience does not mean it is a consert.
exists x1 x2 x3 x4 x5.(n_backdrop(x5) & n_light(x3) & of(x3,x4) & n_stage(x4) & a_topic(x1) & at(x1,x2) & as(x2,x5) & with(x2,x3) & n_event(x2) & n_audience(x1))
exists x1 x2 x3.(a_topic(x1) & at(x1,x3) & n_consert(x3) & of(x1,x2) & n_fan(x2) & n_group(x1))