(S (S (PP (IN For) (NP (BASENP (NNS countries)) (SBAR (WHADVP (WRB where)) (S (BASENP (DT the) (NN MM/DD/YY) (NN convention)) (VP (VBZ is) (ADJP (RBR more) (JJ common))))))) (COMMA ,) (S (BASENP (DT the) (NN event)) (VP (VP (VBD happened) (ADVP (BASENP (DT a) (NN month)) (RB ago))) (PP (IN on) (BASENP (NN 5th) (NNP April)))))) (PERIOD .))