The event is the definition of a crowd pleaser, replete with appearances by the Rockettes, the Mormon Tabernacle Choir, and Santa Claus (the act isn't entirely without bite; there's also a very funny moment involving a heart attack).
( ( The event ) ( ( is ( ( ( ( ( ( ( ( ( the definition ) ( of ( a ( crowd pleaser ) ) ) ) , ) ( ( replete ( with appearances ) ) ( by ( the Rockettes ) ) ) ) , ) ( the ( Mormon ( Tabernacle Choir ) ) ) ) , ) and ) ( ( Santa Claus ) ( -LRB- ( ( ( the act ) ( ( ( is n't ) entirely ) ( without ( ( bite ; ) ( there ( ( 's also ) ( ( a ( ( very funny ) moment ) ) ( involving ( a ( heart attack ) ) ) ) ) ) ) ) ) ) -RRB- ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN event)) (VP (VBZ is) (NP (NP (DT the) (NN definition)) (PP (IN of) (NP (DT a) (NN crowd) (NN pleaser))) (, ,) (VP (ADJP (JJ replete) (PP (IN with) (NP (NNS appearances)))) (PP (IN by) (NP (DT the) (NNPS Rockettes)))) (, ,) (NP (DT the) (NNP Mormon) (NNP Tabernacle) (NNP Choir)) (, ,) (CC and) (NP (NP (NNP Santa) (NNP Claus)) (PRN (-LRB- -LRB-) (S (NP (DT the) (NN act)) (VP (VBZ is) (RB n't) (ADVP (RB entirely)) (PP (IN without) (NP (NP (NN bite)) (: ;) (S (NP (EX there)) (VP (VBZ 's) (ADVP (RB also)) (NP (NP (DT a) (ADJP (RB very) (JJ funny)) (NN moment)) (PP (VBG involving) (NP (DT a) (NN heart) (NN attack)))))))))) (-RRB- -RRB-))))) (. .)))
If Santa Claus has a heart attack, the Rockettes will have to save Christmas.
( ( If ( ( Santa Claus ) ( has ( a ( heart attack ) ) ) ) ) ( , ( ( the Rockettes ) ( ( will ( have ( to ( save Christmas ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NNP Santa) (NNP Claus)) (VP (VBZ has) (NP (DT a) (NN heart) (NN attack))))) (, ,) (NP (DT the) (NNPS Rockettes)) (VP (MD will) (VP (VB have) (S (VP (TO to) (VP (VB save) (NP (NNP Christmas))))))) (. .)))