A young boy is playing the trumpet at a concert.
An old man is playing the banjo in bed by himself.
A person cannot be old and young simultaneously.  You cannot play a trumpet if you are playing a banjo.  A concert would not be in a bed.
exists e1 s1 x1 x2 x3.(n_trumpet(x2) & at(e1,x3) & n_concert(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(n_male(x2) & n_banjo(x2) & by(e1,x2) & in(e1,x3) & n_bed(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_man(x1) & a_old(s1) & Theme(s1,x1))