This is the 5473rd most frequent Korean word.
만찬에서
"At the banquet."
In this context, '만찬에서' indicates the occasion ('at the banquet') on which the speech was given.
그는 만찬에서 귀한 손님들에게 환영사를 전했습니다.
He delivered a welcoming speech to the esteemed guests at the banquet.
'만찬에서' describes the event ('at the banquet') during which the meeting with others took place.
만찬에서 만난 사람들과 곧 다시 보기로 약속했습니다.
We promised to see again soon with the people we met at the banquet.
Here, '만찬에서' specifies the location ('at the banquet') where the action of enjoying food occurred.