参さん加か自じ由ゆう

noun which may take the genitive case particle 'no', noun

open to all; anyone can join

Describes an event or activity where participation is unrestricted; anyone may take part.

• このイベントは参さん加か自じ由ゆうです。

  This event is open to everyone.

noun which may take the genitive case particle 'no', noun

optional; not compulsory

Used when attendance or participation is not required; you can choose whether to take part.

• 会かい議ぎへの出しゅっ席せきは参さん加か自じ由ゆうです。

  Attendance at the meeting is optional.