a DJ in the middle of the room pushing buttons on a machine.
A person is pushing buttons on a machine at a birthday party.
The DJ is not necessarily performing at a birthday party.
exists e1 s1 x1 x2 x3 x4 x5.(n_room(x2) & n_middle(x1) & a_topic(s1) & in(s1,x1) & of(x1,x2) & on(e1,x5) & n_machine(x5) & Theme(e1,x4) & Actor(e1,x3) & v_push(e1) & n_buttons(x4) & (x2 = x3) & ne_org_dj(s1))
exists e1 x1 x2 x3 x4 x5.(at(e1,x4) & n_party(x4) & of(x4,x5) & n_birthday(x5) & on(e1,x3) & n_machine(x3) & Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_buttons(x2) & n_person(x1))