Four men in a band playing together on a stage.
A band at a gig.
Four men in a band playing together on a stage does not imply they are a band at a gig.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & on(e1,x4) & n_stage(x4) & a_together(s1) & Manner(e1,s1) & Actor(e1,x3) & v_play(e1) & (x2 = x3) & n_band(x2) & n_man(x1) & card_eq_4(x1))
exists x1 x2.(a_topic(x1) & at(x1,x2) & n_gig(x2) & n_band(x1))