(S (S (NP (BASENP (NNP CowParade)) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (VP (ADVP (RB first)) (VP (VP (VBN held) (PP (IN in) (BASENP (NNP Zurich)))) (PP (IN in) (BASENP (NN 1998)))))))) (COMMA ,))) (VP (VP (VBZ has) (VP (VBN been) (VP (VBN held) (PP (IN in) (NP (BASENP (NN 22) (NNS cities)) (PP (IN in) (BASENP (NN 5) (NNS continents)))))))) (CC and) (VP (VP (VBZ is) (BASENP (NN today))) (NP (ADJP (BASENP (DT the) (NN world) (POS 's)) (JJS largest)) (BASENP (JJ public) (NN art) (NN event)))))) (PERIOD .))