(S (S (BASENP (JJ Mass) (NNS celebrations)) (VP (VBP are) (VP (VBN planned) (S (VP (TO to) (VP (VB be) (VP (VBN held) (PP (IN at) (NP (BASENP (NNP Poklonnaya) (NNP Gora)) (COMMA ,) (NP (BASENP (NNP Moscow) (POS 's)) (BASENP (JJ primary) (NNP WW2) (NN memorial)))))))))))) (PERIOD .))