possibility of participation; able to participate
Used to indicate whether someone can join an event, meeting, or activity. Often appears in formal or written contexts such as invitations, schedules, and eligibility statements.
Please check the number of people who can participate.
Anyone can participate in this event.
参加 is the act of participating; 参加可能 focuses on the possibility or eligibility to participate.
可能 is a general word for possibility; 参加可能 is a specific compound for participation possibility.
Compound of 参加 (participation) and 可能 (possible). The exact historical derivation is uncertain, but the meaning is transparent from its components.