(S (S (SBAR (IN As) (S (BASENP (NNS people)) (VP (VBD flocked) (PP (TO to) (NP (BASENP (DT the) (NN community) (NN hall)) (SBAR (WHADVP (WRB where)) (S (BASENP (DT the) (NN event)) (VP (VBD was) (VP (VBG taking) (BASENP (NN place))))))))))) (COMMA ,) (S (NP (BASENP (NNS people)) (PP (IN outside) (BASENP (DT the) (NNS premises)))) (VP (VP (VBD began) (S (VP (VP (VBG climbing) (BASENP (DT the) (NNS walls))) (PP (IN in) (NP (BASENP (DT an) (NN effort)) (S (VP (TO to) (VP (VB get) (PRT (RP in)))))))))) (COMMA ,) (S (VP (VBG initiating) (BASENP (DT the) (NN collapse))))))) (PERIOD .))