An orchestra of about 30 people are practicing on the stage of what appears to be an auditorium full of green chairs.
The Rochester, NY Philharmonic practicing before opening night of their 2014 orchestral season.
There are many orchestras other than The Rochester NY Philharmonic.  Practicing does not happen exclusively before opening night.  Practicing does not imply any sort of timestamp that would pinpont the 2014 orchestral season.
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 s1 s2 x1 x2 x3 x4 x5 x6 x7.(n_season(x7) & a_orchestral(s2) & Theme(s2,x7) & n_date(x7) & a_date_year_2014(x7) & a_date_year_2014(x7) & of(x7,x1) & n_thing(x1) & n_practicing(x1) & (x1 = x4) & ne_org_philharmonic(x4) & (x1 = x3) & ne_org_ny(x3) & a_,(s1) & Theme(s1,x1) & (x1 = x2) & ne_org_rochester(x2) & a_topic(x1) & Theme(e1,x6) & Actor(e1,x5) & v_open(e1) & of(x6,x7) & n_night(x6) & (x1 = x5))