This is the 9412th most frequent Korean word.
결의대회에
"결의대회에" means "at a resolution meeting" or "at an assembly for determination."
'결의대회에' indicates the destination or location where the event (resolution meeting) took place as a target of people's action (attending).
결의대회에 많은 사람들이 참석했습니다.
Many people attended the resolution meeting.
'결의대회에' again marks the location (resolution meeting) involved in the action, emphasizing absence this time.
그는 결의대회에 참석하지 않았습니다.
He did not attend the resolution meeting.
Here, '결의대회에 대한' means 'about the resolution meeting', slightly expanding the construct meaning.