Definition of 参加自由 (さんかじゆう)

no-adjective, noun
1.
free-for-all, open-to-all
2.
optional (to participate in), non-compulsory
Related Kanji
nonplussed, three (in documents), going, coming, visiting, visit, be defeated, die, be madly in love, participate, take part in
add, addition, increase, join, include, Canada
oneself
wherefore, a reason