A band is playing at an outdoor music festival.
The festival wasn't going on yet.
A band cannot be playing if the festival isn't going on yet
exists e1 s1 x1 x2 x3.(at(e1,x2) & n_festival(x2) & of(x2,x3) & n_music(x3) & a_outdoor(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_band(x1))
exists x1.(n_festival(x1) & -exists e1 x2.(on(e1,x2) & n_yet(x2) & Actor(e1,x1) & v_go(e1)))