People playing instruments on stage in front of blue banners.
The people are giving a lecture at a business conference.
Playing instruments and giving a lecture are separate actions. A stage and business conference are different locations.
exists e1 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(e1,x5) & of(x5,x6) & n_banner(x6) & a_blue(s1) & Theme(s1,x6) & n_front(x5) & on(e1,x4) & n_stage(x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_instrument(x3) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3 x4.(n_people(x1) & at(e1,x3) & n_conference(x3) & of(x3,x4) & n_business(x4) & Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_lecture(x2))