This is the 12722nd most frequent Korean word.
대학교에서
"At the university."
Here, '대학교에서' indicates the location where the subject studies economics, denoting the university.
저는 대학교에서 경제학을 공부합니다.
I study economics at the university.
In this sentence, '대학교에서' is used to describe the place where the action of making friends occurred, which is the university.
대학교에서 새로운 친구들을 사귀었습니다.
I made new friends at the university.
'대학교에서' in this context specifies the venue for the festival, showing the university as the location of the event.