performers are performing for an audience.
The performers perform.
both have performers.
exists e1 x1 x2.(for(e1,x2) & n_audience(x2) & Actor(e1,x1) & v_perform(e1) & n_performer(x1))
exists e1 x1.(n_performer(x1) & Actor(e1,x1) & v_perform(e1))