A band plays a concert for fans.
A theater troupe performs Shakespeare at the park.
Either the people performing are a troupe or a band. They are either playing a concert or performing Shakespeare. They cannot do either situation simultaneously.
exists e1 x1 x2 x3.(for(e1,x3) & n_fan(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_concert(x2) & n_band(x1))
exists e1 x1 x2 x3 x4.(n_park(x4) & at(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_shakespeare(x3) & n_troupe(x1) & of(x1,x2) & n_theater(x2))