This is the 2952nd most frequent Korean word.
참석
"참석" means "attendance" or "participation."
The word '참석' is used here as a noun referring to 'attendance', and the infinitive '참석하다' means to attend a formal event.
저는 내일 회의에 참석할 예정입니다.
I am planning to attend the meeting tomorrow.
In this example, '참석하지 않았습니다' indicates the negation of attending—the past tense of not attending an occasion.
그녀는 학교 동창회에 참석하지 않았습니다.
She did not attend the school reunion.
Here, '참석 여부' means 'the matter of attendance', highlighting whether or not someone will participate in something.