This is the 2408th most frequent Korean word.
기념식에
"At the commemorative ceremony."
The word '기념식에' is used to indicate the location or event of the commemorative ceremony that is the focus of the action (attendance) in the sentence.
우리는 내일 기념식에 참석할 예정입니다.
We plan to attend the commemorative ceremony tomorrow.
Here, '기념식에' signifies the event to which the subject was invited, emphasizing the action of invitation.
기념식에 초대받아서 정말 기뻤어요.
I was really happy to be invited to the commemorative ceremony.
In this sentence, '기념식에' highlights the venue of the gathering, the commemorative ceremony.