A group of teenage girls do a synchronized dance in Hanna Montana costumes.
Girls dancing at a halloween party.
You cannot infer that the time of the event is a halloween party.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(Theme(e2,x4) & Actor(e2,x1) & v_do(e2) & in(x4,x5) & n_costume(x5) & (x5 = x7) & ne_geo_montana(x7) & (x5 = x6) & ne_geo_hanna(x6) & n_dance(x4) & Theme(e1,x4) & v_synchronize(e1) & of(x1,x2) & n_girl(x2) & of(x2,x3) & n_teenage(x3) & n_group(x1))
exists x1 x2 x3 x4.(a_topic(x1) & at(x1,x3) & n_party(x3) & of(x3,x4) & n_halloween(x4) & n_dancing(x1) & (x1 = x2) & ne_nam_girls(x2))