before it builds up to its insanely staged ballroom scene , in which 3000 actors appear in full regalia 
(ROOT (S (ADVP (IN before)) (NP (PRP it)) (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 (ADVP (IN )) (NP (PRP )) (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 )))))))))))