A young man is sitting in front of a drum.
The man sits in front of the drum before the performance.
You can not infer there is going to be a performance.
exists e1 s1 x1 x2 x3.(in(e1,x2) & of(x2,x3) & n_drum(x3) & n_front(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(n_performance(x4) & n_drum(x3) & n_man(x1) & before(e1,x4) & in(e1,x2) & of(x2,x3) & n_front(x2) & Actor(e1,x1) & v_sit(e1))