builds up to its insanely staged ballroom scene , in which 3000 actors appear in full regalia 
(ROOT (S (VP (VBZ builds) (PRT (RP up)) (PP (IN to) (NP (NP (PRP$ its) (ADJP (RB insanely) (VBN staged)) (NN ballroom) (NN scene)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (CD 3000) (NNS actors)) (VP (VBP appear) (PP (IN in) (NP (JJ full) (NN regalia)))))))))))
(ROOT (S (VP (VBZ ) (PRT (RP )) (PP (IN ) (NP (NP (PRP$ ) (ADJP (RB ) (VBN )) (NN ) (NN )) (, ) (SBAR (WHPP (IN ) (WHNP (WDT ))) (S (NP (CD ) (NNS )) (VP (VBP ) (PP (IN ) (NP (JJ ) (NN )))))))))))