An orchestra of about 30 people are practicing on the stage of what appears to be an auditorium full of green chairs.
An orchestra prepares for their opening night show.
Practicing on stage does not imply it is for opening night.
exists e1 x1 x2 x3.(n_stage(x3) & exists e2 p1 x4.(n_thing(x4) & on(e1,x3) & of(x3,x4) & Topic(e2,p1) & Actor(e2,x4) & v_appear(e2) & exists p2 s1 s2 x5 x6 x7.((x4 = x5) & of(s1,x7) & n_chair(x7) & a_green(s2) & Theme(s2,x7) & Theme(s1,x6) & a_full(s1) & (x5 = x6) & n_auditorium(x5))) & Actor(e1,x1) & v_practice(e1) & of(x1,x2) & n_people(x2) & n_date(x2) & a_date_day_30(x2) & a_date_day_30(x2) & r_about(x2) & n_orchestra(x1))
exists e1 x1 x2 x3 x4.(for(e1,x2) & n_show(x2) & of(x2,x4) & n_night(x4) & of(x2,x3) & n_opening(x3) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_prepare(e1) & n_orchestra(x1))