さんかじゆう 参加自由 LinksSentence search for 参加自由Sentence search for さんかじゆうKanji details for 参, 加, 自 and 由Edit in JMdict Noun which may take the genitive case particle 'no', Noun1. free-for-all; open-to-allNoun which may take the genitive case particle 'no', Noun2. optional (to participate in); non-compulsory Discussions Log in to talk about this word.