(S (S (NP (BASENP (DT The) (NN event)) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (VP (ADVP (RB also)) (VP (VBG celebrating) (NP (BASENP (NN fifty) (NNS years)) (SBAR (IN since) (S (BASENP (DT the) (NN pavement)) (VP (VBD was) (VP (VBN founded))))))))))) (COMMA ,))) (VP (VP (VP (VBD took) (BASENP (NN place))) (PP (IN during) (BASENP (DT the) (NN night)))) (PP (IN for) (BASENP (DT the) (JJ first) (NN time))))) (PERIOD .))